linux-yocto.inc: Run kernel_version_sanity_check with final source

linux-yocto.inc: Run kernel_version_sanity_check with final source

Ensure that the kernel_version_sanity_check task runs after all source
modifications are complete, including any that are introduced during the
kernel_metadata task. This also avoids any race condition issues when
kernel_version_sanity_check and kernel_metadata tasks are running at the
same time.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>