MAINTAINERS: Update maintainer for dwc2

Update to show Minas Harutyunyan as the new maintainer for dwc2.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>