MAINTAINERS: Add linux-phy list and patchwork

Linux-phy subsystem gained mailing list and a patchwork instance. Add the
details to MAINTAINERS file

Signed-off-by: Vinod Koul <[e-mail]>

MAINTAINERS

···
 GENERIC PHY FRAMEWORK
 M:	Kishon Vijay Abraham I <[e-mail]>
 M:	Vinod Koul <[e-mail]>
-L:	[e-mail]
+L:	[e-mail]
 S:	Supported
+Q:	https://patchwork.kernel.org/project/linux-phy/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy.git
 F:	Documentation/devicetree/bindings/phy/
 F:	drivers/phy/