sthal: fix chre package unload failed in call

note: Skip destory chre buffer plugin during
      incall mode to avoid race condition when
      CHRE is active.

Test: verify chre related task.
Bug: 136425157
Change-Id: I68237c541a1724c23514a9083690a177679d47c1
Signed-off-by: JJ Lee <leejj@google.com>
1 file changed