Bugfix pwm

[NikhitaR-IFX]

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Description

• Fixed calculations in PWM duty_u16 --> get and set functions
• Set duty_ns using pwm_duty_set_ns()
• Implemented DUT tests for PWM
• Removed invert functionality as this is currently not working and enabling this requires more efforts which challenges the current implementation of the module.

Related Issue
DESMAKERS-3621

[jaenrig-ifx]

Nice 👍 Only missing thing is the docs, making a note that "invert" is not available. Also update any example using "invert".

[NikhitaR-IFX]

Nice 👍 Only missing thing is the docs, making a note that "invert" is not available. Also update any example using "invert".

Thanks for noticing. Done now.