scripts/code_cov_gather_on_build.sh: Improve the script

- speedup the script by allowing Sparse file detection instead
  of libz compression;

- use realpath for the paths to allow running them from everywhere;

- Speedup tarball generation by limiting the source file scope to
  the DRM subsystem;

- Indent with tabs instead of spaces.

Reviewed-by: Tomi Sarvela <tomi.p.sarvela@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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