DisplayIdentification: guard EDID IDs with stable_edid_ids()

Allow for the fabrication of EDID-based display IDs via the
stable_edid_ids() flag in DisplayIdentification.

Bug: 415036639
Flag: com.android.graphics.surfaceflinger.flags.stable_edid_ids
Test: presubmit
Change-Id: I64abf8c783b168126cfac6aa044adf9359f3feb8