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/chromebook_bob_defconfig b/configs/chromebook_bob_defconfig
index 55c5320..ec51d71 100644
--- a/configs/chromebook_bob_defconfig
+++ b/configs/chromebook_bob_defconfig
@@ -39,6 +39,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-gru-bob"
 CONFIG_OF_SPL_REMOVE_PROPS="pinctrl-0 pinctrl-names clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
 CONFIG_ENV_IS_IN_MMC=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_I2C_CROS_EC_TUNNEL=y
 CONFIG_SYS_I2C_ROCKCHIP=y