Camera2: Move non-ZSL shutter sound firing to be later.

Instead of firing shutter sound when capture request is submitted for
non-ZSL captures, fire it when the metadata frame is received. This
guarantees that the shutter sound fires after picture capture is
completed by the sensor.

Bug: 7259900
Change-Id: I4a1eeed89ed0400bf80b0f0cc2d5799c3d9bb9e3