[Sival pwm] Add a pwm smoketest #2358

Job	Run time
Lint (quick)	3m 9s
Verible lint	1m 4s
Airgapped build	9m 27s
Lint (slow)	8m 55s
CW305's Bitstream	21m 45s
Verilated Earl Grey	1h 21m 22s
Verilated English Breakfast	8m 1s
Build Docker Containers	2m 41s
Build and test software	15m 53s
Earl Grey for CW310 / Build bitstream	1m 47s
Earl Grey for CW310 Hyperdebug / Build bitstream	1m 59s
Earl Grey for CW340 / Build bitstream	1m 47s
CW310 Test ROM Tests / FPGA test	5m 15s
CW310 ROM Tests / FPGA test	48m 1s
CW310 ROM_EXT Tests / FPGA test	7m 41s
CW310 Manufacturing Tests / FPGA test	25m 27s
CW310 SiVal Tests / FPGA test	22m 51s
CW310 SiVal ROM_EXT Tests / FPGA test	25m 8s
Cache bitstreams to GCP	0s
CW340 ROM_EXT Tests / FPGA test	4m 11s
CW340 ROM Tests / FPGA test	3m 19s
CW340 SiVal Tests / FPGA test	15m 47s
CW340 Test ROM Tests / FPGA test	8m 50s
CW340 Manufacturing Tests / FPGA test	8m 27s
CW340 SiVal ROM_EXT Tests / FPGA test	5m 0s
Verify FPGA jobs	40s
	5h 38m 27s

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