vexpress64: juno: add androidboot.hardware=juno

Linaro's Juno Android builds requires the androidboot.hardware parameter
be set to a know board name.

Non-Android kernels ignore this extra parameter because they don't
contain code to parse it.
Signed-off-by: NRyan Harkin <ryan.harkin@linaro.org>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>

include/configs/vexpress_aemv8a.h

@@ -200,6 +200,7 @@
 				"rootwait "\
 				"earlyprintk=pl011,0x7ff80000 debug "\
 				"user_debug=31 "\
+				"androidboot.hardware=juno "\
 				"loglevel=9"
 
 /* Copy the kernel and FDT to DRAM memory and boot */