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System is triggered by falling edge of touch interrupt pin, and the touch can't
power off during suspend, so if touch the screen during suspend, the touch
interrupt pin will changed to low status, but system can't response the falling
edge interrupt for it's in suspend, then the touch interrupt pin will stay low
status. After resume, the system will not accept any falling edge interrpt from
touch, that leads the touch no response after resume.
The solution here is: in later resume, read the touch data if the interrupt
pin of touch is low status, then the interrupt pin of touch will return to high
after reading the touch data.
Signed-off-by: LiGang <b41990@freescale.com>
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