phy: rockchip: samsung-hdptx: Rename ambiguous rk_hdptx_phy->rate

The main purpose of the ->rate member of struct rk_hdptx_phy is to
implement rk_hdptx_phy_clk_recalc_rate() by providing the actual rate
programmed in hardware.  Hence the current naming is too generic and
rather ambiguous.

Improve clarity by renaming ->rate to ->hw_rate.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Link: https://lore.kernel.org/r/20250318-phy-sam-hdptx-bpc-v6-12-8cb1678e7663@collabora.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>