msm: Ignore rpm_notify flag for l2 spm

Ignore the rpm_notify flag for l2 spm as some devices support putting
l2 into low power modes such as GDHS while the core is doing standalone
power collapse (non-rpm notified).

Change-Id: I5009339152a0af3ed823da08272f46487c2d67ba
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>