asoc: fsa8500: Add IRQ state read retry.

If the IRQ status read failed due to i2c error, the interrupt
will not be cleared and the detection will not be called
anymore even if the i2c bus is recovered. Add a retry in 2 sec
for the case when IRQ status was not read correctly.
Also 10ms delay was added between short press and release button
events for better handling by the framework.
Signed-off-by: Vladimir Karpovich <vkarpovich@motorola.com>

Change-Id: I2c95bbb66079a2bf1a94c61b06c933e7629d42a0