MAINTAINERS: add IRC to ARM sub-architectures and Devicetree

Mention the IRC channels used for discussions about ARM/ARM64
sub-architectures and Devicetree.  This documents purely existing state.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]'
Signed-off-by: Arnd Bergmann <[email protected]>

Author: krzk

MAINTAINERS

@@ -1620,13 +1620,15 @@ M:	Olof Johansson <[email protected]>
 M:	[email protected]
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
+C:	irc://irc.libera.chat/armlinux
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
 F:	arch/arm/boot/dts/Makefile
 F:	arch/arm64/boot/dts/Makefile
 
 ARM SUB-ARCHITECTURES
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
+C:	irc://irc.libera.chat/armlinux
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git
 F:	arch/arm/mach-*/
 F:	arch/arm/plat-*/
@@ -14393,6 +14395,7 @@ M:	Rob Herring <[email protected]>
 M:	Frank Rowand <[email protected]>
 L:	[email protected]
 S:	Maintained
+C:	irc://irc.libera.chat/devicetree
 W:	http://www.devicetree.org/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
 F:	Documentation/ABI/testing/sysfs-firmware-ofw
@@ -14404,6 +14407,7 @@ OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
 M:	Rob Herring <[email protected]>
 L:	[email protected]
 S:	Maintained
+C:	irc://irc.libera.chat/devicetree
 Q:	http://patchwork.ozlabs.org/project/devicetree-bindings/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
 F:	Documentation/devicetree/