MAINTAINERS: ARM/WPCM450: Add 'W:' line with wiki

The wiki is a useful source of 3rd-party information about the SoC,
mostly hardware documentation.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220218160834.320200-1-j.neuschaefer@gmx.net
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/MAINTAINERS b/MAINTAINERS
index d84dde4..e1f92b9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2374,6 +2374,7 @@
 M:	Jonathan Neuschäfer <j.neuschaefer@gmx.net>
 L:	openbmc@lists.ozlabs.org (moderated for non-subscribers)
 S:	Maintained
+W:	https://github.com/neuschaefer/wpcm450/wiki
 F:	Documentation/devicetree/bindings/*/*wpcm*
 F:	arch/arm/boot/dts/nuvoton-wpcm450*
 F:	arch/arm/mach-npcm/wpcm450.c