libgui: Add discardFreeBuffers callback to producer
This enables buffer producer to clear its buffer caches. Test: Camera CTS, libgui_test Bug: 136677409 Bug: 145617243 Change-Id: I7f46e977f3edc3b08177654531745d8ca0b86889 Merged-In: I7f46e977f3edc3b08177654531745d8ca0b86889
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