soc: qcom: rpm: Change driver memory allocation to use GFP_NOIO

When a filesystem driver calls into makes a RPM request, RPM driver
makes a kzalloc request with GFP_NOFS flag. This results in a
deadlock if a driver waiting on IO completion sends a RPM message.

Change memory allocation in the RPM driver to use GFP_NOIO.

Change-Id: Ie986b6eb21845b679f068372e46dfb402f234dcf
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>