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/arch/arm/Makefile b/arch/arm/Makefile
index 87d9d4b..8173025 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -81,6 +81,7 @@
 machine-$(CONFIG_TEGRA)			+= tegra
 machine-$(CONFIG_ARCH_UNIPHIER)		+= uniphier
 machine-$(CONFIG_ARCH_ZYNQ)		+= zynq
+machine-$(CONFIG_ARCH_ZYNQMP)		+= zynqmp
 machine-$(CONFIG_ARCH_VERSAL)		+= versal
 machine-$(CONFIG_ARCH_ZYNQMP_R5)	+= zynqmp-r5