mtd: msm_qpic_nand: fix issue with runtime pm code

The runtime pm code expects the driver data to be set but
that is not set until after almost all of runtime pm initilization
code is complete. This would result in runtime pm code trying to
get the driver data and would cause a NULL pointer access since it
is not set up by then.

Change-Id: I18a9be6b3c97fb21e98818e67626473ca76dfdfd
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>