wifi: ath11k: cleanup struct ath11k_reg_tpc_power_info

Remove unused 'ap_constraint_power' field of 'struct
ath11k_reg_tpc_power_info' and adjust related comment.
Compile tested only.

Fixes: 6f4e235b ("wifi: ath11k: add parse of transmit power envelope element")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Acked-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20241111070152.85140-2-dmantipov@yandex.ru


Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>