Convert CONFIG_SYS_INIT_RAM_LOCK to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_INIT_RAM_LOCK

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/kmeter1_defconfig b/configs/kmeter1_defconfig
index 0aba19b..c998a07 100644
--- a/configs/kmeter1_defconfig
+++ b/configs/kmeter1_defconfig
@@ -10,6 +10,7 @@
 CONFIG_ENV_ADDR=0xF00C0000
 CONFIG_MPC83xx=y
 CONFIG_HIGH_BATS=y
+CONFIG_SYS_INIT_RAM_LOCK=y
 CONFIG_TARGET_KMETER1=y
 CONFIG_DDR_MC_CLOCK_MODE_1_1=y
 CONFIG_SYSTEM_PLL_VCO_DIV_4=y