linux-phytec-fsl

MAINTAINERS: add pxa dma driver to pxa architecture

Add the pxa dma driver as maintained by the pxa architecture
maintainers, as it is part of the core IP.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>