media: platform: fix cros-ec-cec build error

Fix build when MFD_CROS_EC is not enabled but COMPILE_TEST=y.
Fixes this build error:

ERROR: "cros_ec_cmd_xfer_status" [drivers/media/platform/cros-ec-cec/cros-ec-cec.ko] undefined!
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/Kconfig

@@ -541,6 +541,8 @@ config VIDEO_CROS_EC_CEC
 	depends on MFD_CROS_EC
 	select CEC_CORE
 	select CEC_NOTIFIER
+	select CHROME_PLATFORMS
+	select CROS_EC_PROTO
 	---help---
 	  If you say yes here you will get support for the
 	  ChromeOS Embedded Controller's CEC.