MAINTAINERS: Maintainer change for hisi_dma

I am moving on to other things and longfang is going to
take over the role of hisi_dma maintainer. Update the
MAINTAINERS accordingly.

Signed-off-by: Jie Hai <haijie1@huawei.com>
Acked-by: Zhou Wang <wangzhou1@hisilicon.com>
Link: https://lore.kernel.org/r/20250402085423.347526-1-haijie1@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: Jie Hai

MAINTAINERS

@@ -10642,7 +10642,7 @@ F:	net/dsa/tag_hellcreek.c
 
 HISILICON DMA DRIVER
 M:	Zhou Wang <wangzhou1@hisilicon.com>
-M:	Jie Hai <haijie1@huawei.com>
+M:	Longfang Liu <liulongfang@huawei.com>
 L:	dmaengine@vger.kernel.org
 S:	Maintained
 F:	drivers/dma/hisi_dma.c