drm/rockchip: dw_hdmi: Add phy_config for 594Mhz pixel clock

Add phy_config for 594Mhz pixel clock used for HDMI2.0 display modes.

Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240908145511.3331451-4-jonas@kwiboo.se