cm_audio: Rename Doink.oog to CyanDoink.oog to prevent override

PRODUCT_COPY_FILES vendor/cm/prebuilt/common/media/audio/
notifications/Doink.ogg:system/media/audio/notifications/Doink.ogg
ignored.

This is due to Doink.oog already existing in frameworks/base

Change-Id: I7ab091680f9cb0fb349ff425cb3ee1273d32ee89