MAINTAINERS: Update entry for BCM5301X ARM

Add myself as I contribute to it. Include Broadcom's feedback ML as
suggested by Florian. Finally modify file rule to match
bcm5301x-nand-cs0-bch8.dtsi.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
[florian: change L to M as suggested]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

MAINTAINERS

@@ -2511,10 +2511,12 @@ F:	arch/mips/include/asm/mach-bcm47xx/*
 
 BROADCOM BCM5301X ARM ARCHITECTURE
 M:	Hauke Mehrtens <hauke@hauke-m.de>
+M:	Rafał Miłecki <zajec5@gmail.com>
+M:	bcm-kernel-feedback-list@broadcom.com
 L:	linux-arm-kernel@lists.infradead.org
 S:	Maintained
 F:	arch/arm/mach-bcm/bcm_5301x.c
-F:	arch/arm/boot/dts/bcm5301x.dtsi
+F:	arch/arm/boot/dts/bcm5301x*.dtsi
 F:	arch/arm/boot/dts/bcm470*
 
 BROADCOM BCM63XX ARM ARCHITECTURE