build_plan: allow slim only in staging for kernel 4.14 branch.

Prepare for launch by scheduling only scheduling slim builds in staging
and limiting it to the third_party/kernel 4.14 branch.

BUG=chromium:1094321, chromium:1123776

Change-Id: Ice758dd3d68d61f846a60b48b8dc2d938410c1ef
Commit-Queue: Navil Perez <>
Tested-by: Navil Perez <>
Reviewed-by: Sean Abraham <>
Reviewed-by: David Burger <>
2 files changed