Remove the function hal_btcoex_SetChipType() as it does nothing and
produces the following gcc warning when compiling with W=1.

drivers/staging/rtl8723bs/hal/hal_btcoex.c:1182:30: warning: variable 'pHalData' set but not used [-Wunused-but-set-variable]
 1182 |         struct hal_com_data *pHalData;
      |                              ^~~~~~~~
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230324084334.12183-1-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>