MAINTAINERS: Add file patterns for mips brcm device tree bindings

Submitters of device tree binding documentation may forget to CC
the subsystem maintainer if this is missing.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Cc: Hauke Mehrtens <[email protected]>
Cc: Rafał Miłecki <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/13339/
Signed-off-by: Ralf Baechle <[email protected]>

MAINTAINERS

@@ -2421,6 +2421,7 @@ M:	Hauke Mehrtens <[email protected]>
 M:	Rafał Miłecki <[email protected]>
 L:	[email protected]
 S:	Maintained
+F:	Documentation/devicetree/bindings/mips/brcm/
 F:	arch/mips/bcm47xx/*
 F:	arch/mips/include/asm/mach-bcm47xx/*