Revert "FROMLIST: pwm: Convert period and duty cycle to u64"

This reverts commit d2ee0ef1

Causes build errors on 5.8-rc1, hopefully a new version will be
submitted upstream, no need to keep this around at the moment.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I9d13a5b727ebc9dd4aaa591bb64d28adef8cb38c