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_mips64el_defconfig b/configs/qemu_mips64el_defconfig
index 04c4484..577bf42 100644
--- a/configs/qemu_mips64el_defconfig
+++ b/configs/qemu_mips64el_defconfig
@@ -4,6 +4,7 @@
 CONFIG_SYS_LITTLE_ENDIAN=y
 CONFIG_CPU_MIPS64_R1=y
 CONFIG_BOOTDELAY=10
+CONFIG_MISC_INIT_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="qemu-mips64el # "
 CONFIG_CMD_IMLS=y