Input: msc_touchkey - remove the driver

Input: msc_touchkey - remove the driver

MCS-5000/5080 chips belong to the 1st generation of Melfas chips,
manufactured in 2000-2007.

The driver relies on custom platform data (no DT support) and there
never were any users of this driver in the mainline kernel. It is likely
that the driver was (like mcs5000_ts driver) was tested on S3C6410 NCP
board (with Samsung S3C6410 SoC), but the touchkey device was never
added to the board file. This board was removed in v6.3 in commit
743c8fbb90ca ("ARM: s3c: remove most s3c64xx board support").

Remove the driver since there are no users.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240714060029.1528662-2-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>