staging: rtl8723bs: delete extern declarations in core/rtw_ap.c

staging: rtl8723bs: delete extern declarations in core/rtw_ap.c

delete extern declaration in .c file (RTW_WPA_OUI) and
fix the following checkpatch issues:

WARNING: externs should be avoided in .c files
14: FILE: drivers/staging/rtl8723bs/core/rtw_ap.c:14:
+extern unsigned char WMM_OUI[];
--
WARNING: externs should be avoided in .c files
15: FILE: drivers/staging/rtl8723bs/core/rtw_ap.c:15:
+extern unsigned char WPS_OUI[];
--
WARNING: externs should be avoided in .c files
16: FILE: drivers/staging/rtl8723bs/core/rtw_ap.c:16:
+extern unsigned char P2P_OUI[];

Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/e48480113c7ffc5128d867787bb3f73b3eb505ae.1616422773.git.fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>