mb/google/drallion: Enable UART console for arcada_cml and sarien_cml

Drallion uses UART 0 for console, other two variants remain as UART 2.

BUG=b:139095062
TEST=emerge-drallion coreboot chromeos-bootimage.
     Console should be visible.

Change-Id: I520a07ad6f755bc2e6481329fc69bef9a36e31e2
Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35785
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-by: Mathew King <mathewk@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/drallion/Kconfig

@@ -84,7 +84,9 @@ config MAX_CPUS
 
 config UART_FOR_CONSOLE
 	int
-	default 0
+	default 2 if BOARD_GOOGLE_ARCADA_CML
+	default 2 if BOARD_GOOGLE_SARIEN_CML
+	default 0 if BOARD_GOOGLE_DRALLION
 
 config VARIANT_DIR
 	string