When building some avr32 boards out of tree (e.g. O=..) the linker script could
not be found. This patch references the linker script in source tree.
Signed-off-by: Andreas Bießmann <biessmann@corscience.de>
 PLATFORM_RELFLAGS      += -ffunction-sections -fdata-sections
 PLATFORM_LDFLAGS       += --gc-sections
 TEXT_BASE              = 0x00000000
-LDSCRIPT               = $(obj)board/atmel/atstk1000/u-boot.lds
+LDSCRIPT               = $(src)board/atmel/atstk1000/u-boot.lds
 
 PLATFORM_RELFLAGS      += -ffunction-sections -fdata-sections
 PLATFORM_LDFLAGS       += --gc-sections
 TEXT_BASE              = 0x00000000
-LDSCRIPT               = $(obj)board/earthlcd/favr-32-ezkit/u-boot.lds
+LDSCRIPT               = $(src)board/earthlcd/favr-32-ezkit/u-boot.lds