MAINTAINERS: dmaengine: Microchip: add Tudor Ambarus as co-maintainer

Add Tudor Ambarus as co-maintainer for both Microchip DMA drivers and
take the opportunity to merge both entries.

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20200716071524.25642-1-ludovic.desroches@microchip.com


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