MAINTAINERS: attach arch/arm/configs/mvebu_*_defconfig to relevant maintainers

The arch/arm/configs/mvebu_*_defconfig currently don't belong to any
maintainer, so get_maintainer returns only information based on
commits, which is not completely accurate.

Therefore, this commit replaces a useless empty newline in MAINTAINERS
by a line attaching those defconfigs to the appropriate Marvell EBU
maintainers.
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

@@ -1322,7 +1322,7 @@ F:	drivers/rtc/rtc-armada38x.c
 F:	arch/arm/boot/dts/armada*
 F:	arch/arm/boot/dts/kirkwood*
 F:	arch/arm64/boot/dts/marvell/armada*
-
+F:	arch/arm/configs/mvebu_*_defconfig
 
 ARM/Marvell Berlin SoC support
 M:	Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>