staging: rtl8188eu: rename Hal_MappingOutPipe() - style

Rename Hal_MappingOutPipe() to avoid CamelCase.
Hal_MappingOutPipe -> hal_mapping_out_pipe

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>