redhat: fix conditional for kernel-debuginfo files directive

redhat: fix conditional for kernel-debuginfo files directive

Commit 443dd5367e0cd9050ad39a6594c5be521271b4e9 added support for a
separate debuginfo package for the kernel module.  Unfortunately, the
%files directive for the kernel module debuginfo package was incorrectly
placed in the %if stanza of the build_userspace condition, so the
rpmbuild fails when attempting to build just the kernel module.

That is, when running rpmbuild with the options:

    rpmbuild --define "build_userspace 0" --define "build_modules 1" ...

rpmbuild fails with:

    RPM build errors:
       Installed (but unpackaged) file(s) found:
       /usr/lib/debug/lib/modules/.../extra/openafs/openafs.ko.debug

Fix this by moving the new %files directive out of the build_userspace
conditional.

Reviewed-on: https://gerrit.openafs.org/12874
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit f599e1ce6354c42a9c0c8f7205ba8a03c35ea72b)

Change-Id: I07e25d3dd43b2cd7056cefb8f0f5c10f78347b85
Reviewed-on: https://gerrit.openafs.org/12875
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>