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/novena_defconfig b/configs/novena_defconfig
index 6a076f8..7eda3ac 100644
--- a/configs/novena_defconfig
+++ b/configs/novena_defconfig
@@ -19,6 +19,7 @@
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="console=ttymxc1,115200 "
 CONFIG_BOOTCOMMAND="run distro_bootcmd ; run net_nfs"
+CONFIG_MISC_INIT_R=y
 CONFIG_VERSION_VARIABLE=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL_EXT_SUPPORT=y