Convert CONFIG_ARCH_MISC_INIT to Kconfig

This converts the following to Kconfig:
   CONFIG_ARCH_MISC_INIT

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/colibri_t30_defconfig b/configs/colibri_t30_defconfig
index 2ab6764..15c2a20 100644
--- a/configs/colibri_t30_defconfig
+++ b/configs/colibri_t30_defconfig
@@ -7,6 +7,7 @@
 CONFIG_CONSOLE_MUX=y
 CONFIG_SYS_STDIO_DEREGISTER=y
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_ARCH_MISC_INIT=y
 CONFIG_SYS_PROMPT="Colibri T30 # "
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set