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/integratorap_cm946es_defconfig b/configs/integratorap_cm946es_defconfig
index 1868c70..a268c28 100644
--- a/configs/integratorap_cm946es_defconfig
+++ b/configs/integratorap_cm946es_defconfig
@@ -5,6 +5,7 @@
 CONFIG_CM946ES=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x8000
+CONFIG_SYS_LOAD_ADDR=0x7fc0
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/mtdblock0 console=ttyAM0 console=tty"
 # CONFIG_DISPLAY_CPUINFO is not set