input: ft5x06_ts: fix the Focaltech CTP current leakage issue

Focaltech touch controller does not go to sleep in suspend because
the pinctrl operation inadvertently resets the touch controller.
Remove the pinctrl operation in suspend and resume callback to
prevent this spurious reset.

CRs-fixed: 677169
Change-Id: Ifa02c0287195d7ce55fb2d8ac49ec1c8ae5baec9
Signed-off-by: Mao Li <maol@codeaurora.org>