Convert CONFIG_SYS_CONSOLE_IS_IN_ENV and CONFIG_CONSOLE_MUX to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_CONSOLE_IS_IN_ENV
   CONFIG_CONSOLE_MUX

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Re-order, re-migrate]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/controlcenterd_36BIT_SDCARD_DEVELOP_defconfig b/configs/controlcenterd_36BIT_SDCARD_DEVELOP_defconfig
index 6ddfab1..e7ffb99 100644
--- a/configs/controlcenterd_36BIT_SDCARD_DEVELOP_defconfig
+++ b/configs/controlcenterd_36BIT_SDCARD_DEVELOP_defconfig
@@ -10,6 +10,8 @@
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_EXTRA_OPTIONS="SDCARD,DEVELOP"
 CONFIG_BOOTDELAY=10
+# CONFIG_CONSOLE_MUX is not set
+CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_IMLS is not set