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/controlcenterd_TRAILBLAZER_DEVELOP_defconfig b/configs/controlcenterd_TRAILBLAZER_DEVELOP_defconfig
index 3d6be0e..d91b94a 100644
--- a/configs/controlcenterd_TRAILBLAZER_DEVELOP_defconfig
+++ b/configs/controlcenterd_TRAILBLAZER_DEVELOP_defconfig
@@ -25,6 +25,7 @@
 CONFIG_CMD_TPM=y
 # CONFIG_CMD_IRQ is not set
 CONFIG_DOS_PARTITION=y
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
 CONFIG_FSL_ESDHC=y
 # CONFIG_PCI is not set