ppc64-diag: Spec file update
ppc64-diag: Spec file update

- Cleanup spec file
- Added source code URL
- Added systemd as run time dependency
- Fixed directory creation issue

Signed-off-by: Vasant Hegde <a6d753843573f7bfed5075c1e875b0be8007a0ab@linux.vnet.ibm.com>

leitao/ppc64-diag,leitao/ppc64-diag,leitao/ppc64-diag,leitao/ppc64-diag