correct sequence about granting permission of SoundTriggerTestApp

After Android S, any SoundTriggerClient should have permission first,
then register the module to framework.

Adjust the grant permission sequence of SoundTriggerTestApp to avoid
confusion.

Bug: b/176943913
Test: Test SoundTriggerTestApp manually.
Change-Id: I3d66119b5fccb27a4dfad880cb7882d0dfb64297
1 file changed