Convert CONFIG_STANDALONE_LOAD_ADDR to Kconfig

This converts the following to Kconfig:
   CONFIG_STANDALONE_LOAD_ADDR

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/qemu-riscv32_defconfig b/configs/qemu-riscv32_defconfig
index 425bb37..844c953 100644
--- a/configs/qemu-riscv32_defconfig
+++ b/configs/qemu-riscv32_defconfig
@@ -9,6 +9,7 @@
 CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
 CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x80200000
 CONFIG_SYS_MONITOR_LEN=786432
+CONFIG_STANDALONE_LOAD_ADDR=0x80200000
 CONFIG_FIT=y
 CONFIG_DISPLAY_CPUINFO=y
 CONFIG_DISPLAY_BOARDINFO=y