Use parent_hws instead of hanving parent_data with just a single .hw
entry to speed up and simplify parent lookups.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220928145609.375860-3-dmitry.baryshkov@linaro.org