cnss: Update pre-allocation table

Update pre-allocation table in order to fulfill latest WLAN host driver's
scan request since it may fail to get a large chuck of memory when all
the pre-allocated memory are in use. Also remove WARN_ON since it already
prints errors when memory request fails.

Change-Id: I52f1856552b38a02fddbfacc0e3ebf7b3a4d4ba2
CRs-Fixed: 662637
Signed-off-by: Yue Ma <yuem@codeaurora.org>