wifi: ath11k: Don't exit on wakeup failure

Currently, ath11k_pcic_read() returns an error if wakeup()
fails, this makes firmware crash debug quite hard because we can
get nothing.

Change to go ahead on wakeup failure, in that case we still may
get something valid to check. There should be no mislead due
to incorrect content because we are aware of the failure with the
log printed.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1

Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220928015140.5431-1-quic_bqiang@quicinc.com