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/qemu_mips_defconfig b/configs/qemu_mips_defconfig
index ece5e64..a6950fc 100644
--- a/configs/qemu_mips_defconfig
+++ b/configs/qemu_mips_defconfig
@@ -2,6 +2,7 @@
 CONFIG_SYS_TEXT_BASE=0xBFC00000
 CONFIG_TARGET_QEMU_MIPS=y
 CONFIG_BOOTDELAY=10
+CONFIG_MISC_INIT_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="qemu-mips # "
 CONFIG_CMD_IMLS=y