pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function
This prepares the pwm-renesas-tpu driver to further changes of the pwm core outlined in the commit introducing devm_pwmchip_alloc(). There is no intended semantical change and the driver should behave as before. Also convert the to_tpu_device() helper macro to a static inline to get some type safety. Link: https://lore.kernel.org/r/aac4a9546b0f474d991144aa925c83cfa7abe2c0.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
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