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/ls2088ardb_qspi_SECURE_BOOT_defconfig b/configs/ls2088ardb_qspi_SECURE_BOOT_defconfig
index b55fc6f..9f1f719 100644
--- a/configs/ls2088ardb_qspi_SECURE_BOOT_defconfig
+++ b/configs/ls2088ardb_qspi_SECURE_BOOT_defconfig
@@ -13,6 +13,7 @@
 CONFIG_QSPI_BOOT=y
 CONFIG_BOOTDELAY=10
 # CONFIG_USE_BOOTCOMMAND is not set
+CONFIG_MISC_INIT_R=y
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y