dmaengine: dw-edma: Fix comments offset characters' alignment

Fix comments offset characters' alignment to follow the same structure
of similar comments.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/8e0e1e46e1c1a78fe62d08c4ee09fb96254a9393.1613674948.git.gustavo.pimentel@synopsys.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>