MAINTAINERS: ARM Versatile Express platform, add missing pattern

VE's reset driver lives at the third level of the directories:

	drivers/power/reset/vexpress-poweroff.c

and wasn't matched by the */*/vexpress* pattern.

Added additional pattern for all files at this level. This should be
enough for a while...
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -1505,6 +1505,7 @@ S:	Maintained
 F:	arch/arm/boot/dts/vexpress*
 F:	arch/arm/mach-vexpress/
 F:	*/*/vexpress*
+F:	*/*/*/vexpress*
 F:	drivers/clk/versatile/clk-vexpress-osc.c
 F:	drivers/clocksource/versatile.c