qcacmn: Add log while dropping FW diag events
FW diag events will be dropped when number FW diag events pending for
processing is reached to configured RX_DIAG_WQ_MAX_SIZE value. Add a
log when these diag events a getting dropped for debugging purpose.
Change-Id: Ifc303991bdf274fa7426794eaf71517722e9f386
CRs-Fixed: 2824458