ARM: kirkwood: move SOC sources to mach-kirkwood

Move
arch/arm/cpu/arm926ejs/kirkwood/* -> arch/arm/mach-kirkwood/*

Note:
 Perhaps, can we merge arch/arm/mach-kirkwood and
 arch/arm/mvebu-common into arch/arm/mach-mvebu, like Linux?

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Stefan Roese <sr@denx.de>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Luka Perkov <luka.perkov@sartura.hr>
diff --git a/MAINTAINERS b/MAINTAINERS
index 63085fc..e4edf45 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -99,7 +99,7 @@
 M:	Luka Perkov <luka.perkov@sartura.hr>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-marvell.git
-F:	arch/arm/cpu/arm926ejs/kirkwood/
+F:	arch/arm/mach-kirkwood/
 F:	arch/arm/include/asm/arch-kirkwood/
 
 ARM MARVELL PXA