Integrate meta-guf-distro/xconfig-nobranch

Commit: https://gitlab.com/SECO-Northern-Europe/yocto/layers/meta-guf-distro/-/commit/112329496a8e3b5d5d6017918e7a3060ed3ed4b1

xconfig: Add nobranch=1 to SRC_URI to allow build of not yet merged commits

Builds of commits that are not merged yet (in a merge request) fail if nobrach=1 is not set, as they are not found on the specified branch, even if the revision is specified in SRV_REV explicitly.