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/BSC9131RDB_SPIFLASH_defconfig b/configs/BSC9131RDB_SPIFLASH_defconfig
index 918c134..76721d4 100644
--- a/configs/BSC9131RDB_SPIFLASH_defconfig
+++ b/configs/BSC9131RDB_SPIFLASH_defconfig
@@ -9,6 +9,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="SPIFLASH"
 CONFIG_BOOTDELAY=10
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+# CONFIG_MISC_INIT_R is not set
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_I2C=y