drm/rockchip: dsi: Add dphy_get_timing support for multiple PHY types

Currently, there are generally two types of DPHY for Rockchip. One is
the DPHY used by RK3288/RK3399, whose timing is described by Table A-3
High-Speed Transition Times in the databook. The other is the DPHY used
by PX30 and its successors. If its timing is still described using
RK3288/RK3399, it may not perform correctly on some DSI panel.

Add dphy_get_timing for different D-PHY types to adapt to timing
differences. The configuration details are as follows:

- RK3288/RK3399: Select the corresponding entry from the timing table based
                 on the data rate.
- PX30 and later platforms: Use a fixed timing configuration.

Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20260914013331.108-3-kernel@airkyi.com

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