pwm fixes for 6.3

A commit merged for 6.2-rc1 (namely c73a3107624d ("pwm: Handle
.get_state() failures")) resulted in passing an uninitialized struct
pwm_state to lowlevel driver's .get_state() callback. Together with some
lowlevel drivers not overwriting all members of this output variable,
this resulted in a crash on an Amlogic Meson G12B board reported by
Munehisa Kamata.

The patches in this pull request fix this twice:

 a) by ensuring that all pwm drivers set the .polarity member
 b) by zero initializing the memory passed to .get_state()
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