1. use rockchip,split-mode instead of split-mode;
2. rockchip,split-mode is split two same display interface and register
one connector;
3. rockchip,dual-connector-split is split two different display interface and
register two connectors;
4. use rockchip,left-display to identify the left display.
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Change-Id: I425f80951fd5c99b31aa250383384500bae5f5f5