power: sequencing: qcom-wcn: improve support for wcn6855

WCN6855 (also known as QCA6490) is similar to the already supported
QCA6390 but takes in two more supplies so add a new vregs list for it.

On sm8450-hdk it also requires a short assert of the xo-clk pin so add
handling for it in a dedicated unit.

As we now have a separate set of targets for this variant, store the
pointer to the targets struct associated with a model in the device
match data.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20241018-sc8280xp-pwrseq-v6-2-8da8310d9564@linaro.org


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>