ARM: zynq: move SoC sources to mach-zynq

Move arch/arm/cpu/armv7/zynq/* -> arch/arm/mach-zynq/*

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>