drm_hwcomposer: Fix GetDisplayIdentificationData

Fix GetDisplayIdentificationData, introduced
by commit: b3d81781.
Edid data should be copied instead of assign.

Signed-off-by: Andrii Chepurnyi <andrii_chepurnyi@epam.com>
3 jobs for mr_fix_edid in 35 seconds (queued for 1 second)
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passed checkstyle #2278293

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failed checkstyle #2278291

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failed checkstyle #2278268

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