MAINTAINERS: ARM FREESCALE IMX: remove invalid path

arch/arm/cpu/armv7/mx*/ does not relate to any existing directory.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>

MAINTAINERS

@@ -111,7 +111,6 @@ S:	Maintained
 T:	git git://git.denx.de/u-boot-imx.git
 F:	arch/arm/cpu/arm1136/mx*/
 F:	arch/arm/cpu/arm926ejs/mx*/
-F:	arch/arm/cpu/armv7/mx*/
 F:	arch/arm/cpu/armv7/vf610/
 F:	arch/arm/mach-imx/
 F:	arch/arm/include/asm/arch-imx/