drivers: staging: rtl8188eu: use 'ccflags-y' instead of EXTRA_CFLAGS in Makefile

If command line use EXTRA_CFLAGS (e.g. "EXTRA_CFLAGS=-mmedium-calls"
for arc architecture, with allmodconfig), it can not pass compiling,
the related error:

  drivers/staging/rtl8188eu/core/rtw_ap.c:22:27: fatal error: osdep_service.h: No such file or directory

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>