kernel-yocto: fix checkout bare-cloned kernel repositories
The existing code doesn't tell regular (with .git) and bare cases and
just move the unpacked repo to the place of kernel source. But later
steps will fail on a bare-cloned repo because we can not checkout
directly in a bare cloned repo.
This change performs another clone to fix the issue.
Note: This change doesn't cover the case that S and WORKDIR are same
and the repo is bare cloned.
Signed-off-by: Jianxun Zhang <jianxun.zhang@linux.intel.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
(cherry picked from commit
ccfa2ee5c4f509de4c18a7054b2a66fc874d5d69)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
