MAINTAINERS: Match all of bindings/arm/npcm/ as part of NPCM architecture

All files in Documentation/devicetree/bindings/arm/npcm/ belong to the
Nuvoton NPCM architecture, even when their names might not spell it out
explicitly.
Signed-off-by: NJonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220129115228.2257310-3-j.neuschaefer@gmx.netSigned-off-by: NJoel Stanley <joel@jms.id.au>

MAINTAINERS

@@ -2363,6 +2363,7 @@ L:	openbmc@lists.ozlabs.org (moderated for non-subscribers)
 S:	Supported
 F:	Documentation/devicetree/bindings/*/*/*npcm*
 F:	Documentation/devicetree/bindings/*/*npcm*
+F:	Documentation/devicetree/bindings/arm/npcm/*
 F:	arch/arm/boot/dts/nuvoton-npcm*
 F:	arch/arm/mach-npcm/
 F:	drivers/*/*npcm*