MAINTAINERS: Add myself as a reviewer for CADENCE USB3 DRD IP DRIVER

I would like to help in reviewing CADENCE USB3 DRD IP DRIVER patches
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

MAINTAINERS

@@ -3846,6 +3846,7 @@ CADENCE USB3 DRD IP DRIVER
 M:	Peter Chen <peter.chen@nxp.com>
 M:	Pawel Laszczak <pawell@cadence.com>
 M:	Roger Quadros <rogerq@ti.com>
+R:	Aswath Govindraju <a-govindraju@ti.com>
 L:	linux-usb@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git