audio: libaudioeffect_jni GREF leak fix

- Excessive JNI global reference in AudioEffects.
- Global references created during native setup
  are not deleted.
- Global references are deleted in setup failure
  and during native release.

Change-Id: I3c90f3a00b2552b4b783375928afc94a7e441449
CRs-fixed: 413633
(cherry picked from commit f60e70097b84c4ef26eeb31024d52e5b1fc8aa64)
(cherry picked from commit 9c9279277ad10582ff3dcf5cad576d2d7f036569)