rtl8723au: Remove FSF address and C99 comments from os_dep/*.c

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove remaining FSF address from header files

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove include/circ_buf.h

This header only contained two macro definitions, and neither was used in
any code.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove most typedefs from include/wlan_bssdef.h

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