dma: dw: remove leftovers in the comment blocks

There is couple of leftovers in the comment blocks. This patch modifies the
comments accordingly.

There is no functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --cc drivers/dma/dw/core.c
Simple merge

diff --cc include/linux/dw_dmac.h
Simple merge