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/bananapi_m2_berry_defconfig b/configs/bananapi_m2_berry_defconfig
index 75fd0b1..de03a76 100644
--- a/configs/bananapi_m2_berry_defconfig
+++ b/configs/bananapi_m2_berry_defconfig
@@ -11,6 +11,7 @@
 CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-v40-bananapi-m2-berry"
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SCSI_AHCI=y
 CONFIG_AXP_DLDO4_VOLT=2500
 CONFIG_AXP_ELDO3_VOLT=1200