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/pcm052_defconfig b/configs/pcm052_defconfig
index 123b238..910de42 100644
--- a/configs/pcm052_defconfig
+++ b/configs/pcm052_defconfig
@@ -11,6 +11,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="vf610-pcm052"
 CONFIG_ENV_OFFSET_REDUND=0xC0000
 CONFIG_TARGET_PCM052=y
+CONFIG_SYS_LOAD_ADDR=0x82000000
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/phytec/pcm052/imximage.cfg"
 CONFIG_BOOTDELAY=3
 CONFIG_BOARD_EARLY_INIT_F=y