kernel-yocto: fix non-git builds

The ability to build non-git repositories was broken by two changes:

 - The existence of an empty 'patches' directory created during the
   unpack phase. This dir was incorrectly identified as a valid meta
   directory and broke the build. By ensuring that it is removed before
   creating the empty repository, it will no longer be found instead of
   the real meta directory.

 - The attempt to reset the git repository to a specific SRCREV when
   no SRCREV was provided. By checking for a SRCREV of 'INVALID', we
   avoid any processing and failed git operations.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

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