MAINTAINERS: Add maintainer for HiSilicon DMA engine driver

Add myself as the maintainer of HiSilicon DMA engine driver.

Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Link: https://lore.kernel.org/r/1584062624-196854-1-git-send-email-wangzhou1@hisilicon.com


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