PL080S has separate register to store transfer size in, allowing single
transfer to be much larger than in standard PL080.

This patch makes the amba-pl08x driver aware of this and removes writing
transfer size to reserved bits of CH_CONTROL register on PL080S, which
was not a problem witn transfer sizes fitting the original bitfield
of PL080, but now would overwrite other fields.
Signed-off-by: NTomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>