MAINTAINERS: wifi: ath: remove Kalle

I'm stepping down as ath10k, ath11k and ath12k maintainer so remove me from
MAINTAINERS file and Device Tree bindings. Jeff continues as the maintainer.

As my quicinc.com email will not work anymore so add an entry to .mailmap file
to direct the mail to my kernel.org address.

Signed-off-by: Kalle Valo <kvalo@kernel.org>
Acked-by: Jeff Johnson <jjohnson@kernel.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20250203180445.1429640-1-kvalo@kernel.org