Input: ts4800 - add hardware dependency

The Technologic Systems TS-4800 is an i.MX515 board, so its drivers
are useless unless building a SOC_IMX51 kernel, except for build
testing purposes.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/Kconfig

@@ -952,6 +952,7 @@ config TOUCHSCREEN_TOUCHIT213
 config TOUCHSCREEN_TS4800
 	tristate "TS-4800 touchscreen"
 	depends on HAS_IOMEM && OF
+	depends on SOC_IMX51 || COMPILE_TEST
 	select MFD_SYSCON
 	select INPUT_POLLDEV
 	help