zynqmp: Kconfig: Move zynqmp Kconfig

Move the zynqmp Kconfig from board to arch
as there may be different boards under same
architecture.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/cpu/armv8/zynqmp/Kconfig

@@ -0,0 +1,15 @@
+if TARGET_XILINX_ZYNQMP
+
+config SYS_BOARD
+	default "zynqmp"
+
+config SYS_VENDOR
+	default "xilinx"
+
+config SYS_SOC
+	default "zynqmp"
+
+config SYS_CONFIG_NAME
+	default "xilinx_zynqmp"
+
+endif