Add a CONFIG_BRUNO Kconfig flag.

Some of the backports patches check this define.

Change-Id: I9f9b7ba4c698ff8d67ae10960e588d633de9410c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 433bccf..1b952d7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2300,3 +2300,5 @@
 source "lib/Kconfig"
 
 source "arch/arm/kvm/Kconfig"
+
+source "arch/arm/bruno/Kconfig"
diff --git a/arch/arm/bruno/Kconfig b/arch/arm/bruno/Kconfig
new file mode 100644
index 0000000..a691cba
--- /dev/null
+++ b/arch/arm/bruno/Kconfig
@@ -0,0 +1,5 @@
+config BRUNO
+	bool "BRUNO Platform"
+	default y
+	help
+	  This enables support for BRUNO platform.