MAINTAINERS: mediatek: Update SoC entry

Add IRC channel and URL of the wiki.
Also add soc drivers folder and regex to catch more
mediatek components.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

MAINTAINERS

@@ -1738,13 +1738,17 @@ ARM/Mediatek SoC support
 M:	Matthias Brugger <matthias.bgg@gmail.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
+W:	https://mtk.bcnfs.org/
+C:	irc://chat.freenode.net/linux-mediatek
 S:	Maintained
 F:	arch/arm/boot/dts/mt6*
 F:	arch/arm/boot/dts/mt7*
 F:	arch/arm/boot/dts/mt8*
 F:	arch/arm/mach-mediatek/
 F:	arch/arm64/boot/dts/mediatek/
+F:	drivers/soc/mediatek/
 N:	mtk
+N:	mt[678]
 K:	mediatek
 
 ARM/Mediatek USB3 PHY DRIVER