input: touchpanel: fix TP frozen when ST's TP firstly probe up

Set TP to display-unblank status when firstly probe up, so that
TP can detect interrupt and report touch event without press
power key.

Change-Id: I6e4ea48551463c6d0f747987d7c255987e3a11df
Signed-off-by: Jin Fu <jinf@codeaurora.org>