imx: imx8qm_rom7720_a1: add missing DTS to the MAINTAINERS

add the dts file to the MAINTAINERS entry

Signed-off-by: Oliver Graute <oliver.graute@kococonnector.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: uboot-imx <uboot-imx@nxp.com>
1 file changed