MAINTAINERS: Update Cirrus Logic codec driver maintainers

Brian & Paul are no longer active audio codec driver
maintainers. Update list to reflect myself and David
Rhodes as the active maintainers.

Signed-off-by: James Schulman <james.schulman@cirrus.com>
Link: https://lore.kernel.org/r/20200310192751.24487-1-james.schulman@cirrus.com


Signed-off-by: Mark Brown <broonie@kernel.org>