drm: bridge: icn6211: Add and use hs_rate and lp_rate

Fill in hs_rate and lp_rate to struct mipi_dsi_device for this bridge and
adjust DSI input frequency calculations such that they expect the DSI host
to configure HS clock according to hs_rate.

This is an optimization for the DSI burst mode case. In case the DSI device
supports DSI burst mode, it is recommended to operate the DSI interface at
the highest possible HS clock frequency which the DSI device supports. This
permits the DSI host to send as short as possible bursts of data on the DSI
link and keep the DSI data lanes in LP mode otherwise, which reduces power
consumption.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Jagan Teki <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Robert Foss <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: [email protected]
Signed-off-by: Linus Walleij <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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