usb: musb: various cosmetic fixes on ux500 files

Various non functional coding style fixes on ux500_dma.c and
phy-ab8500-usb.c drivers.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>