corstone1000: update meta-arm-image for kirkstone support.

Update the sha for meta-arm-image in the corstone1000 kas file to
add support for kirkstone. Without this support corstone1000 does
not build.

Signed-off-by: Harry Moulton <harry.moulton@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: e6dc0edbc61d633b6cccb9188103455f6ae7a7ea
+     refspec: 9f611833ef58394b707836d69356c4e27d0265fc 
 
 local_conf_header:
   base: |