env: Add CONFIG_SYS_RELOC_GD_ENV_ADDR symbol

Today in initr_reloc_global_data() we use some non-obvious tests to
determine if we need to relocate the env_addr within gd or not.  In
order to facilitate migration of other symbols to Kconfig we need to
introduce a new symbol for this particular use case.

Cc: Wolfgang Denk <wd@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/BSC9132QDS_SPIFLASH_DDRCLK100_defconfig b/configs/BSC9132QDS_SPIFLASH_DDRCLK100_defconfig
index 309159e..c40f726 100644
--- a/configs/BSC9132QDS_SPIFLASH_DDRCLK100_defconfig
+++ b/configs/BSC9132QDS_SPIFLASH_DDRCLK100_defconfig
@@ -26,6 +26,7 @@
 CONFIG_MTDIDS_DEFAULT="nor0=88000000.nor,nand0=ff800000.flash,"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=88000000.nor:256k(dtb),7m(kernel),55m(fs),1m(uboot);ff800000.flash:1m(uboot),8m(kernel),512k(dtb),-(fs)"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_FSL_CAAM=y
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD_NOR_FLASH=y