arm64: zynqmp: Move SoC sources to mach-zynqmp

Similar changes was done for Zynq in past and this patch just follow
this pattern to separate cpu code from SoC code.

Move arch/arm/cpu/armv8/zynqmp/* -> arch/arm/mach-zynqmp/*
And also fix references to these files.

Based on
"ARM: zynq: move SoC sources to mach-zynq"
(sha1: 0107f2403669f764ab726d0d404e35bb9447bbcc)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1cb092e..ecac867 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -362,7 +362,7 @@
 M:	Michal Simek <michal.simek@xilinx.com>
 S:	Maintained
 T:	git git://git.denx.de/u-boot-microblaze.git
-F:	arch/arm/cpu/armv8/zynqmp/
+F:	arch/arm/mach-zynqmp/
 F:	drivers/clk/clk_zynqmp.c
 F:	drivers/fpga/zynqpl.c
 F:	drivers/gpio/zynq_gpio.c