Add a synchronous back-end (scomp) to acomp. This allows to easily expose the already present compression algorithms in LKCF via acomp. Bug: 111209481 Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> (cherry picked from commit 1ab53a77b772bf7369464a0e4fa6fd6499acf8f1) Signed-off-by: Martin Liu <liumartin@google.com> Change-Id: Id2a9cb035627965803814511390dbe56d340e726 Signed-off-by: GhostMaster69-dev <rathore6375@gmail.com>