MAINTAINERS: switch dwc3 to Thinh

Thinh Nguyen has agreed to become the new dwc3 maintainer seeing that
I haven't had time to dedicate to the mailing list.

Signed-off-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20220929074844.351938-1-balbi@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>