rtl8723au: Convert CONFIG_P2P to CONFIG_8723AU_P2P

This change is in preparation for kernel inclusion.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Convert CONFIG_AP_MODE to CONFIG_8723AU_AP_MODE

This change is needed before the code can be added to the kernel.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>