cy8c_ts: Set input property bit to indicate a direct input device

Prop bit is checked in userspace and must be set in
driver in order to be recognized correctly, since it defaults
to mouse pointer.

Change-Id: Ifbd7ffe6633860ab3858cf2b3465d593724c5c64
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>