Convert CONFIG_MISC_INIT_R to Kconfig

This converts the following to Kconfig:
   CONFIG_MISC_INIT_R

Signed-off-by: Adam Ford <aford173@gmail.com>
[trini: Update the defaults logic slightly]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/cm_t54_defconfig b/configs/cm_t54_defconfig
index ed2e558..955a6a5 100644
--- a/configs/cm_t54_defconfig
+++ b/configs/cm_t54_defconfig
@@ -9,6 +9,7 @@
 CONFIG_BOOTDELAY=3
 # CONFIG_USE_BOOTCOMMAND is not set
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
+# CONFIG_MISC_INIT_R is not set
 CONFIG_VERSION_VARIABLE=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x200
 # CONFIG_SPL_NAND_SUPPORT is not set