qcacld-3.0: Add support to pre-allocate DP SRN mem

Add logic to pre-allocate DP consistent memory and reuse later.
Only SRNG memory is preallocated. This is useful to prevent memory
fragmentation over cycles of WLAN ON/OFF.

Change-Id: I1f814f9f18d482eb5f55e0b157606d1792e665f8
CRs-Fixed: 2740424
5 files changed