MAINTAINERS: switch dmaengine tree to kernel.org

I have switched DMAengine tree to kernel.org now, so update in
MAINTAINERS file
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200623143729.781403-1-vkoul@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

MAINTAINERS

@@ -5111,7 +5111,7 @@ M:	Vinod Koul <vkoul@kernel.org>
 L:	dmaengine@vger.kernel.org
 S:	Maintained
 Q:	https://patchwork.kernel.org/project/linux-dmaengine/list/
-T:	git git://git.infradead.org/users/vkoul/slave-dma.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git
 F:	Documentation/devicetree/bindings/dma/
 F:	Documentation/driver-api/dmaengine/
 F:	drivers/dma/