[pwm] Correction to heartbeat mode #3673

Job	Run time
Lint (quick)	3m 2s
Airgapped build	8m 38s
Build documentation	4m 55s
Lint (slow)	11m 26s
Build Docker Containers	2m 24s
CW305's Bitstream	23m 4s
Run OTBN crypto tests	22m 21s
Run OTBN smoke Test	2m 26s
Build and test software	15m 12s
Verible lint	1m 0s
Verilated Earl Grey	1h 28m 59s
Verilated English Breakfast	8m 33s
Earl Grey for CW310 / Build bitstream	1h 13m 17s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 9m 17s
Earl Grey for CW340 / Build bitstream	1h 27m 53s
CW310 SiVal ROM_EXT Tests / FPGA test	33m 41s
CW310 ROM_EXT Tests / FPGA test	8m 52s
CW310 SiVal Tests / FPGA test	27m 25s
CW310 Manufacturing Tests / FPGA test	32m 14s
CW310 Test ROM Tests / FPGA test	4m 38s
CW310 ROM Tests / FPGA test	39m 15s
Cache bitstreams to GCP	0s
CW340 ROM Tests / FPGA test	53s
CW340 ROM_EXT Tests / FPGA test	5m 59s
CW340 SiVal Tests / FPGA test	17m 19s
CW340 Manufacturing Tests / FPGA test	40m 43s
CW340 SiVal ROM_EXT Tests / FPGA test	4m 1s
CW340 Test ROM Tests / FPGA test	3m 2s
Verify FPGA jobs	21s
	10h 40m 50s

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