MAINTAINERS: Add soc_dma to OMAP section

The hw/dma/soc_dma.c code appears to have been written with the idea that it abstracts out DMA transfer operations from the details of a particular DMA controller device. In practice, it's used only by the omap_dma code and I would not today recommend trying to use it in any new DMA device. Add the files to the OMAP section of MAINTAINERS so that patches can be cc'd to the appropriate places. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com> Message-id: 20260710105907.2570621-10-peter.maydell@linaro.org