MAINTAINERS: Fix uniphier-mdmac.c file path

Commit 32e74aa ("dmaengine: uniphier-mdmac: add UniPhier MIO DMAC
driver") wrongly put filepath for uniphier-mdmac.c, fix it

Fixes: 32e74aa ("dmaengine: uniphier-mdmac: add UniPhier MIO DMAC driver")
Reported-by: Joe Perches <joe@perches.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: vinodkoul

MAINTAINERS

@@ -2356,7 +2356,7 @@ F:	arch/arm/mm/cache-uniphier.c
 F:	arch/arm64/boot/dts/socionext/uniphier*
 F:	drivers/bus/uniphier-system-bus.c
 F:	drivers/clk/uniphier/
-F:	drivers/dmaengine/uniphier-mdmac.c
+F:	drivers/dma/uniphier-mdmac.c
 F:	drivers/gpio/gpio-uniphier.c
 F:	drivers/i2c/busses/i2c-uniphier*
 F:	drivers/irqchip/irq-uniphier-aidet.c