MAINTAINERS: mvebu: Add git entry

While there was a git repository used for the mvebu subsystem since many
years, it was not documented. let's add it.
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

MAINTAINERS

@@ -1820,6 +1820,7 @@ F:	arch/arm/mach-orion5x/
 F:	arch/arm/plat-orion/
 F:	arch/arm/boot/dts/dove*
 F:	arch/arm/boot/dts/orion5x*
+T:	git git://git.infradead.org/linux-mvebu.git
 
 ARM/Marvell Kirkwood and Armada 370, 375, 38x, 39x, XP, 3700, 7K/8K SOC support
 M:	Jason Cooper <jason@lakedaemon.net>
@@ -1840,6 +1841,7 @@ F:	drivers/irqchip/irq-armada-370-xp.c
 F:	drivers/irqchip/irq-mvebu-*
 F:	drivers/pinctrl/mvebu/
 F:	drivers/rtc/rtc-armada38x.c
+T:	git git://git.infradead.org/linux-mvebu.git
 
 ARM/Mediatek RTC DRIVER
 M:	Eddie Huang <eddie.huang@mediatek.com>