wifi: ath11k: remove unsupported event handlers

Now that we have a default handler there's no need anymore to list every
unsupported event id anymore, so remove that to clean this up.

While at it remove the pointless todo comment and change the debug message to
follow the preferred style.

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.23

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230609142440.24643-6-kvalo@kernel.org