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/ea-lpc3250devkitv2_defconfig b/configs/ea-lpc3250devkitv2_defconfig
index e8d60b5..5bd57b6 100644
--- a/configs/ea-lpc3250devkitv2_defconfig
+++ b/configs/ea-lpc3250devkitv2_defconfig
@@ -8,6 +8,7 @@
 CONFIG_TARGET_EA_LPC3250DEVKITV2=y
 CONFIG_DEFAULT_DEVICE_TREE="lpc3250-ea3250"
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_SYS_LOAD_ADDR=0x80100000
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 # CONFIG_AUTOBOOT is not set
 # CONFIG_USE_BOOTCOMMAND is not set