drivers:cm33:gpt_pwm: fix high16bit & low16bit can not be zero
Checklist
- 已修改对应的 issue的状态
- MR 的Milestones、Lable都已正确设置
- MR 的 Title、Commit message 足够的简洁且精准
- 足够的信息帮助 reviewer 理解 feature 的大致实现或者 bug 的相关细节
- Ci pipeline 已运行且通过
- 等待 merge
Related
Release notes (Mandatory)
- [csk6/drivers/cm33/gpt_pwm.c] For chip hardware design reasons, if either HIGH16bit and Low16bit is 0, the duty cycle of the output waveform is fixed to 50%