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/C29XPCIE_SPIFLASH_SECBOOT_defconfig b/configs/C29XPCIE_SPIFLASH_SECBOOT_defconfig
index 0f1433a..a8cf2c0 100644
--- a/configs/C29XPCIE_SPIFLASH_SECBOOT_defconfig
+++ b/configs/C29XPCIE_SPIFLASH_SECBOOT_defconfig
@@ -11,6 +11,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="SPIFLASH"
 CONFIG_BOOTDELAY=-1
 CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+# CONFIG_MISC_INIT_R is not set
 CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_IMLS=y