Deprecate pwm implementation #1073

Job	Run time
Check Minimal Dependency Versions	47s
Check minimal feature set	30s
Build Testsuite	37s
Check Documentation Build	35s
Check (stm32f301x6)	38s
Check (stm32f318x8)	34s
Check MSRV	4m 13s
Clippy	37s
Check (stm32f302x6)	36s
Check (stm32f302xb)	36s
Check Codegen	25s
Check (stm32f302xd)	35s
Markdown Lint	9s
Check (stm32f303x6)	33s
Check (stm32f303xb)	36s
Rustfmt	14s
Check (stm32f303xc)	36s
Check (stm32f303xd)	35s
Check (stm32f328x8)	35s
Cargo Deny	16s
Check (stm32f358xc)	36s
Check (stm32f398xe)	37s
Check (stm32f373x8)	34s
Link Checker	9s
Check (stm32f378xc)	37s
Check (stm32f334x4)	37s
	17m 27s

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