Update TF-A version to 2.2

Signed-off-by: Deepika Bhavnani <deepika.bhavnani@arm.com>
Change-Id: Ia03701e2e37e3a00a501b144960a4a65aedbfde9
diff --git a/Makefile b/Makefile
index 18800cb..721246d 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@
 # Trusted Firmware Version
 #
 VERSION_MAJOR			:= 2
-VERSION_MINOR			:= 1
+VERSION_MINOR			:= 2
 
 # Default goal is build all images
 .DEFAULT_GOAL			:= all