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/MCR3000_defconfig b/configs/MCR3000_defconfig
index 924ab16..6254655 100644
--- a/configs/MCR3000_defconfig
+++ b/configs/MCR3000_defconfig
@@ -40,6 +40,7 @@
 CONFIG_SYS_BR7_PRELIM_BOOL=y
 CONFIG_SYS_BR7_PRELIM=0x1C000001
 CONFIG_SYS_OR7_PRELIM=0xFFFF810A
+CONFIG_SYS_LOAD_ADDR=0x200000
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_BOOTDELAY=5
 CONFIG_AUTOBOOT_KEYED=y