dt-bindings: display: panel: Move FriendlyElec HD702E to eDP

dt-bindings: display: panel: Move FriendlyElec HD702E to eDP

The "E" alludes to the fact that FriendlyElec's HD702E is actually an
eDP panel - move its compatible to the appropriate binding doc.

Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/c7f6f75d55a4801eab63a0dc81d14ae27866aca9.1769191673.git.robin.murphy@arm.com