drm/bridge: megachips: add get_edid bridge operation

To prepare for a chained bridge setup add support for the
get_edid bridge operation.
There is no need for a copy of the edid - so drop
the pointer to the copy.

v2:
  - Fix so we do not leak memory (Laurent)

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Cc: Peter Senna Tschudin <[email protected]>
Cc: Martin Donnelly <[email protected]>
Cc: Martyn Welch <[email protected]>
Cc: Andrzej Hajda <[email protected]>
Cc: Neil Armstrong <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Jonas Karlman <[email protected]>
Cc: Jernej Skrabec <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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