Use TARGET_B4420QDS to simplify Kconfig options.
Signed-off-by: York Sun <york.sun@nxp.com>
        bool "Support socrates"
        select ARCH_MPC8544
 
+config TARGET_B4420QDS
+       bool "Support B4420QDS"
+       select SUPPORT_SPL
+       select PHYS_64BIT
+
 config TARGET_B4860QDS
        bool "Support B4860QDS"
        select SUPPORT_SPL
 
-if TARGET_B4860QDS
+if TARGET_B4860QDS || TARGET_B4420QDS
 
 config SYS_BOARD
        default "b4860qds"
 
 CONFIG_SPL_ENV_SUPPORT=y
 CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 
 CONFIG_PPC=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 
 CONFIG_PPC=y
 CONFIG_MPC85xx=y
-CONFIG_TARGET_B4860QDS=y
+CONFIG_TARGET_B4420QDS=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y