thermald: use libmetrics.pc not libmetrics-${libbase_ver}.pc

libmetrics is now providing unversioned library. and versioned
pkg-config file will be removed.

BUG=chromium:920513
TEST=CQ

Change-Id: I72147574c785f60323ad8a75228ed718fc19dbb8
Reviewed-on: https://chrome-internal-review.googlesource.com/c/chromeos/thermald/+/3239583
Commit-Queue: Qijiang Fan <[email protected]>
Tested-by: Qijiang Fan <[email protected]>
Reviewed-by: Hidehiko Abe <[email protected]>
1 file changed