MAINTAINERS: Demote Gustavo Pimentel to DW EDMA driver reviewer

No maintaining actions from Gustavo have been noticed for over a year.
Demote him to being the DW eDMA driver reviewer for now.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20230511190902.28896-13-Sergey.Semin@baikalelectronics.ruSigned-off-by: Vinod Koul <vkoul@kernel.org>

MAINTAINERS

@@ -5885,7 +5885,7 @@ S:	Orphan
 F:	drivers/mtd/nand/raw/denali*
 
 DESIGNWARE EDMA CORE IP DRIVER
-M:	Gustavo Pimentel <gustavo.pimentel@synopsys.com>
+R:	Gustavo Pimentel <gustavo.pimentel@synopsys.com>
 L:	dmaengine@vger.kernel.org
 S:	Maintained
 F:	drivers/dma/dw-edma/