msm: ipa3: fix ipa3_suspend_active_aggr_wa non atomic allocation

ipa3_suspend_active_aggr_wa might be called from interrupt context.
It may sleep while allocating memory in GFP_KERNEL mode.
This change performs the allocation with GFP_ATOMIC instead.

Change-Id: I3894234fc050a3064bbc970c662278eb55864c51
Signed-off-by: Amir Levy <alevy@codeaurora.org>