Convert CONFIG_SPL_GD_ADDR to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_GD_ADDR

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/T2080RDB_revD_SPIFLASH_defconfig b/configs/T2080RDB_revD_SPIFLASH_defconfig
index a5c397d..bb7c711 100644
--- a/configs/T2080RDB_revD_SPIFLASH_defconfig
+++ b/configs/T2080RDB_revD_SPIFLASH_defconfig
@@ -43,6 +43,7 @@
 CONFIG_SPL_SYS_CCSR_DO_NOT_RELOCATE=y
 CONFIG_SPL_FLUSH_IMAGE=y
 CONFIG_SPL_SKIP_RELOCATE=y
+CONFIG_SPL_GD_ADDR=0xfffc8000
 CONFIG_SPL_RELOC_STACK=0xfffd8000
 CONFIG_SPL_RELOC_MALLOC=y
 CONFIG_SPL_RELOC_MALLOC_ADDR=0xfffcb000