Convert CONFIG_SYS_LOAD_ADDR to Kconfig

Now that we have consistent usage, migrate this symbol to Kconfig.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/configs/usbarmory_defconfig b/configs/usbarmory_defconfig
index 427ea7b..911e2e5 100644
--- a/configs/usbarmory_defconfig
+++ b/configs/usbarmory_defconfig
@@ -13,6 +13,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="imx53-usbarmory"
 # CONFIG_CMD_BMODE is not set
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_SYS_LOAD_ADDR=0x72000000
 # CONFIG_USE_BOOTCOMMAND is not set
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_FUSE=y