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/origen_defconfig b/configs/origen_defconfig
index d667b0f..9a09d43 100644
--- a/configs/origen_defconfig
+++ b/configs/origen_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_ORIGEN=y
 CONFIG_IDENT_STRING=" for ORIGEN"
 CONFIG_DEFAULT_DEVICE_TREE="exynos4210-origen"
+CONFIG_SYS_CONSOLE_IS_IN_ENV=y
 CONFIG_SPL=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="ORIGEN # "