msm: pm-8x60: Don't save or restore GIC,VFP state in power collapse

Don't save or restore the GIC,VFP registers when entering or exiting power
collapse. The GIC and VFP drivers already register for PM notifications and
do the respective save/restore thereby making these operations redundant in
pm-8x60 driver.

Change-Id: If9969f8052843b2c7c1417dfeceaab203c6453b5
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>