MAINTAINERS: add irqchip related drivers to Marvell EBU maintainers

This commit updates the MAINTAINERS file so that the Marvell EBU
maintainers are also responsible for their irqchip drivers in
drivers/irqchip/.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

MAINTAINERS

@@ -1495,6 +1495,8 @@ F:	arch/arm/configs/mvebu_*_defconfig
 F:	arch/arm/mach-mvebu/
 F:	arch/arm64/boot/dts/marvell/armada*
 F:	drivers/cpufreq/mvebu-cpufreq.c
+F:	drivers/irqchip/irq-armada-370-xp.c
+F:	drivers/irqchip/irq-mvebu-*
 F:	drivers/rtc/rtc-armada38x.c
 
 ARM/Marvell Berlin SoC support