qcacmn: WAR for RXDMA packet drop issue

When monitor RXDMA is enabled, regular RXDMA will drop a good packet
whenever an error is indicated in monitor path due to a HW bug. To
avoid this, a dummy buffer will be used to receive packets passing
"monitor other" filter on regular DMA, which will be received on
RXDMA2HOST ring. These packets should be ignored based on a special
cookie value.

Change-Id: I348527f662cd664652d8d99c01484bb310c6e705
2 files changed