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/cm_t335_defconfig b/configs/cm_t335_defconfig
index ab9f1fd..0fad9d3 100644
--- a/configs/cm_t335_defconfig
+++ b/configs/cm_t335_defconfig
@@ -39,6 +39,7 @@
 CONFIG_MTDIDS_DEFAULT="nand0=nand"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=nand:2m(spl),1m(u-boot),1m(u-boot-env),1m(dtb),4m(splash),6m(kernel),-(rootfs)"
 CONFIG_ENV_IS_IN_NAND=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_CMD_PCA953X=y
 CONFIG_LED_STATUS=y
 CONFIG_LED_STATUS_GPIO=y