CI: track nanbield branches

meta-clang and meta-virtualisation don't yet have nanbield branches, so
we need to use master for those at the moment.

Signed-off-by: Ross Burton <ross.burton@arm.com>

ci/base.yml

@@ -5,7 +5,7 @@ distro: poky
 
 defaults:
   repos:
-    branch: master
+    branch: nanbield
 
 repos:
   meta-arm:

ci/clang.yml

@@ -4,6 +4,7 @@ header:
 repos:
   meta-clang:
     url: https://github.com/kraj/meta-clang
+    branch: master
 
 local_conf_header:
   toolchain: |

ci/meta-virtualization.yml

@@ -6,3 +6,4 @@ header:
 repos:
   meta-virtualization:
     url: git://git.yoctoproject.org/meta-virtualization
+    branch: master