wifi: ath11k: fix BUFFER_DONE read on monitor ring rx buffer

Perform dma_sync_single_for_cpu() on monitor ring rx buffer before
reading BUFFER_DONE tag and do dma_unmap_single() only after device
had set BUFFER_DONE tag to the buffer.

Also when BUFFER_DONE tag is not set, allow the buffer to get read
next time without freeing skb.

This helps to fix AP+Monitor VAP with flood traffic scenario to see
monitor ring rx buffer overrun missing BUFFER_DONE tag to be set.

Also remove redundant rx dma buf free performed on DP
rx_mon_status_refill_ring.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1

Signed-off-by: Sathishkumar Muruganandam <[email protected]>
Signed-off-by: Harshitha Prem <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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