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/dragonboard410c_defconfig b/configs/dragonboard410c_defconfig
index b8aae59..955ca0b 100644
--- a/configs/dragonboard410c_defconfig
+++ b/configs/dragonboard410c_defconfig
@@ -7,6 +7,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="dragonboard410c"
 CONFIG_IDENT_STRING="\nQualcomm-DragonBoard 410C"
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_SYS_LOAD_ADDR=0x80080000
 # CONFIG_ANDROID_BOOT_IMAGE is not set
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y