Switch RecoverySystem impl to use sun.security.pkcs

Due to org.apache.harmony.security package removal,
RecoverySystem#verifyPackage was rewritten to use
sun.security.pkcs package for verifining package
signature.

(cherry picked from commit 9ad08ec5be0d1e225c9f463fd395ba852b6b5bba)

Change-Id: I04848ad8f045f87224f9d30ff8dd745aac6d08fd
1 file changed