wifi: ath12k: unregister per pdev debugfs

wifi: ath12k: unregister per pdev debugfs

During normal de-initialization path or if any error happens while
registering the hardware, there is no support to unregister the per pdev
debugfs. Add support for the same.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240529043043.2488031-3-quic_adisi@quicinc.com