arm-bsp/tf-a-tests: Add recipe to build and install TFTF

TFTF is TF-A tests that runs at NS-EL2. This is primarily developed to
test the TF-A interfaces exposed to NS code.

Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/corstone1000-base.yml

@@ -31,7 +31,7 @@ repos:
 
   meta-arm-image:
      url: https://git.gitlab.arm.com/arm-reference-solutions/meta-arm-image.git
-     refspec: 9f611833ef58394b707836d69356c4e27d0265fc 
+     refspec: e075959fd718bc3dcedf68965eb9f9205b88d5d0
 
 local_conf_header:
   base: |

kas/tftf.yml

@@ -0,0 +1,7 @@
+header:
+  version: 9
+
+local_conf_header:
+  tftf: |
+    TFA_UBOOT = "0"
+    TFTF_TESTS = "1"