V4L/DVB (7204): remove V4L2_CID_SHARPNESS from meye.h and report private control as DISABLED

- Continue to support the V4L2_CID_PRIVATE_BASE + 1 control in the ABI
 - Report the same control as V4L2_CID_SHARPNESS
 - Report the private control disabled via QUERYCTRL

Signed-off-by: Brandon Philips <bphilips@suse.de>
Acked-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>