rtc: Add snapshot of qpnp rtc driver

This is a snapshot of qpnp rtc driver taken from msm-4.9 commit
<511157374b8> (Merge "mmc: card: Requeue the request if it fails
during issuing").

Change-Id: I08c02ecbd1a6494fc04d451cad8e5f4c508ae97d
Signed-off-by: Mohit Aggarwal <maggarwa@codeaurora.org>