cmd: CMD_CLS should not depend on video

The cls command works fine on the serial console. There is no reason to
let it depend on the availability of video.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

cmd/Kconfig

@@ -1914,7 +1914,6 @@ config CMD_CONITRACE
 
 config CMD_CLS
 	bool "Enable clear screen command 'cls'"
-	depends on DM_VIDEO || LCD || VIDEO
 	default y if LCD
 	help
 	  Enable the 'cls' command which clears the screen contents