staging: mediatek: addres minor style issues flagged by clang-format.

Running clang-format on mtk-hsdma.c I noticed that few lines would not
need to be wrapped, since they fit 80 columns. This change changes such
lines to better fit the style-guide.

Signed-off-by: Armando Miraglia <armax@google.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>