staging: rtl8723bs: remove empty hal/odm_PathDiv.c source file

remove empty hal/odm_PathDiv.c source file.
remove related target in Makefile.

Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/90ebcf46a58375ae25d51638ae91fa40521c6c06.1619794331.git.fabioaiuto83@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>