mmc: Merge tag pm-runtime-6.17-rc1 into next

Merge the tag pm-runtime-6.17-rc1 from
git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm into next

Runtime PM updates related to autosuspend for 6.17

Make several autosuspend functions mark last busy stamp and update
the documentation accordingly (Sakari Ailus).

This is needed to allow additional changes to the mmc subsystem to be
queued for v6.17 too.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>