input: touchscreen: ft5x06: remove unbalanced touch event

Touchscreen driver may generate unbalanced input events when
enter suspend state, these unbalanced event will make input
system always wait for symmetrical input event and can not
handle input event properly. PRESSURE event is removed to
keep input events symmetrical.

CRs-Fixed: 566134
Change-Id: I3f6fda3fb5d0a717ae943a9113be89623c96ce61
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>