pwm: Changes for v6.4-rc1

The bulk of this is trivial conversions to the new .remove_new()
callback for drivers as part of Uwe's effort to clean that up.

Other than that a driver is added for Apple devices and various small
fixes are included for existing drivers.

Last but not least, this finally gets rid of the old pwm_request() and
pwm_free() APIs are removed since the last user was dropped in v6.3.
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