Add libcgrouprc to ld.config.txt.

- In GSI, media.extractor has follow dependency.
media.extractor -> libmpeg2extractor (media ns) ->
libprocessgroup (media ns) -> libcgrouprc (default ns).
If libcgroupsrc can't link from libmpeg2extractor, media.extractor is crashed.

Test: media.extractor didn't die.
Bug: 134981805
Merged-In: I7d3e7e6477708a505b87a884e05cd719f5a3d496
(cherry picked from commit d695733d)

Change-Id: I7d3e7e6477708a505b87a884e05cd719f5a3d496