input: qpnp-power-on: Add support for suspend to disk

Add support to pon driver for suspend to disk feature.
Free interrupts during hibernation and re-register them during
resume. Also, re-configure the boot time registers on resume.

Change-Id: I027d0d44e93b0ca20d8ab6498976886fafb117a0
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>