Move this option to Kconfig and tidy up existing uses.
Signed-off-by: Simon Glass <sjg@chromium.org>
 CONFIG_SPL_MTD_SUPPORT=y
 CONFIG_SPL_MUSB_NEW_SUPPORT=y
 CONFIG_SPL_NAND_SUPPORT=y
+CONFIG_SPL_NET_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 
 CONFIG_SPL_ETH_SUPPORT=y
 CONFIG_SPL_MTD_SUPPORT=y
 CONFIG_SPL_NAND_SUPPORT=y
+CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_NET_VCI_STRING="AM43xx U-Boot SPL"
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 
 CONFIG_SPL=y
 CONFIG_SPL_ETH_SUPPORT=y
 CONFIG_SPL_NET_VCI_STRING="pcm051 U-Boot SPL"
+CONFIG_SPL_NET_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 
 CONFIG_SPL=y
 CONFIG_SPL_ETH_SUPPORT=y
 CONFIG_SPL_NET_VCI_STRING="pcm051 U-Boot SPL"
+CONFIG_SPL_NET_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 # CONFIG_CMD_IMLS is not set
 
 CONFIG_SPL_ETH_SUPPORT=y
 CONFIG_SPL_MTD_SUPPORT=y
 CONFIG_SPL_NAND_SUPPORT=y
+CONFIG_SPL_NET_SUPPORT=y
 CONFIG_SPL_NET_VCI_STRING="AM335x U-Boot SPL"
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 
 /* disable EFI partitions and partition UUID support */
 #undef CONFIG_PARTITION_UUIDS
 #undef CONFIG_EFI_PARTITION
-/* General network SPL  */
-#define CONFIG_SPL_NET_SUPPORT
 #endif
 
 /* USB Device Firmware Update support */
 
 
 #if defined CONFIG_SHC_NETBOOT
 #ifdef CONFIG_SPL_BUILD
-#define CONFIG_SPL_NET_SUPPORT
 #define CONFIG_ENV_IS_NOWHERE
 #undef CONFIG_ENV_IS_IN_MMC
 #endif
 
 /* disable EFI partitions and partition UUID support */
 #undef CONFIG_PARTITION_UUIDS
 #undef CONFIG_EFI_PARTITION
-/* General network SPL  */
-#define CONFIG_SPL_NET_SUPPORT
 #endif
 
 #if defined(CONFIG_EMMC_BOOT)
 
 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ETH_SUPPORT)
 #undef CONFIG_ENV_IS_IN_FAT
 #define CONFIG_ENV_IS_NOWHERE
-#define CONFIG_SPL_NET_SUPPORT
 #endif
 
 #define CONFIG_SYS_RX_ETH_BUFFER       64
 
 /* USB gadget RNDIS */
 
 /* General network SPL, both CPSW and USB gadget RNDIS */
-/*#define CONFIG_SPL_NET_SUPPORT
 #define CONFIG_SPL_NET_VCI_STRING      "AM335x U-Boot SPL"*/
 
 #define CONFIG_SPL_LDSCRIPT            "$(CPUDIR)/am33xx/u-boot-spl.lds"
 
 /* disable EFI partitions and partition UUID support */
 #undef CONFIG_PARTITION_UUIDS
 #undef CONFIG_EFI_PARTITION
-/* General network SPL  */
-#define CONFIG_SPL_NET_SUPPORT
 #endif
 
 /* USB Device Firmware Update support */
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x300
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #undef CONFIG_MII
 #undef CONFIG_PHY_GIGE
 #define CONFIG_PHY_SMSC
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x300
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #undef CONFIG_MII
 #undef CONFIG_PHY_GIGE
 #define CONFIG_PHY_SMSC
 
 #define CONFIG_ENV_IS_NOWHERE
 
 #define CONFIG_SPL_YMODEM_SUPPORT
-#define CONFIG_SPL_NET_SUPPORT
 #define CONFIG_SPL_LDSCRIPT            "$(CPUDIR)/am33xx/u-boot-spl.lds"
 
 #ifdef CONFIG_SPI_BOOT
 
 #define CONFIG_SPL_POWER_SUPPORT
 #define CONFIG_SPL_YMODEM_SUPPORT
 
-/* General network SPL */
-#define CONFIG_SPL_NET_SUPPORT
-
 /* NAND support */
 #define CONFIG_CMD_NAND
 #define CONFIG_NAND_OMAP_GPMC
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x300
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #define CONFIG_PHY_ATHEROS
 
 #define CONFIG_FACTORYSET
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x300
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #undef CONFIG_MII
 #undef CONFIG_PHY_GIGE
 #define CONFIG_PHY_SMSC
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x200
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #define CONFIG_PHY_NATSEMI
 
 #define CONFIG_FACTORYSET
 
 
 #define CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS     0x300
 
-#undef CONFIG_SPL_NET_SUPPORT
-
 #undef CONFIG_MII
 #undef CONFIG_PHY_GIGE
 #define CONFIG_PHY_SMSC