Input: keypad-nomadik-ske - remove the driver

The users of this driver were removed in 2013 in commit 28633c54
("ARM: ux500: Rip out keypad initialisation which is no longer used").

Remove the driver as well.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/Zr-gX0dfN4te_8VG@google.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>