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/stm32mp15-icore-stm32mp1-edimm2.2_defconfig b/configs/stm32mp15-icore-stm32mp1-edimm2.2_defconfig
index 4860ae4..728a5b5 100644
--- a/configs/stm32mp15-icore-stm32mp1-edimm2.2_defconfig
+++ b/configs/stm32mp15-icore-stm32mp1-edimm2.2_defconfig
@@ -12,6 +12,7 @@
 CONFIG_ENV_OFFSET_REDUND=0x2C0000
 # CONFIG_ARMV7_VIRT is not set
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_SYS_LOAD_ADDR=0xc2000000
 CONFIG_FIT=y
 CONFIG_BOOTCOMMAND="run bootcmd_stm32mp"
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION=y