vexpress64: support the Juno Development Platform

The Juno Development Platform is a physical Versatile Express
device with some differences from the emulated semihosting
models. The main difference is that the system is split in
a SoC and an FPGA where the SoC hosts the serial ports at
totally different adresses.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d5399f1..986b4c5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -736,6 +736,10 @@
 	select ARM64
 	select SEMIHOSTING
 
+config TARGET_VEXPRESS64_JUNO
+	bool "Support Versatile Express Juno Development Platform"
+	select ARM64
+
 config TARGET_LS2085A_EMU
 	bool "Support ls2085a_emu"
 	select ARM64