To handle a connected client using WMM-PS, the P2P GO also need to enable
this power save mechanism.

We add WIPHY_FLAG_AP_UAPSD flag to support it and define maximum number
of buffered frames the WMM GO may deliver to the WMM client.
Signed-off-by: NDian-Syuan Yang <dian_syuan0116@realtek.com>
Signed-off-by: NPing-Ke Shih <pkshih@realtek.com>
Signed-off-by: NKalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220922010435.12167-5-pkshih@realtek.com