[prim,clkmgr,rtl] Simplify prim_clock_meas by removing RefCnt #6372

Job	Run time
Lint (quick)	3m 36s
Airgapped build	10m 27s
Build documentation	5m 34s
Build Docker Containers	2m 22s
CW305's Bitstream	24m 24s
Run OTBN crypto tests	2m 44s
Build and test Darjeeling software	4m 7s
Run OTBN smoke Test	3m 9s
QEMU smoketest	2m 26s
Lint (slow)	11m 26s
Build and test software	19m 18s
Verible lint	1m 16s
Verilated Earl Grey	1h 12m 8s
Verilated English Breakfast	8m 4s
Earl Grey for CW310 / Build bitstream	1h 4m 18s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 3m 17s
Earl Grey for CW340 / Build bitstream	1h 29m 32s
CW310 ROM Tests / FPGA test	38m 7s
CW310 Test ROM Tests / FPGA test	3m 55s
Hyper310 ROM_EXT Tests / FPGA test	13m 53s
CW310 SiVal ROM_EXT Tests / FPGA test	32m 57s
CW310 Manufacturing Tests / FPGA test	29m 49s
CW310 SiVal Tests / FPGA test	22m 33s
Cache bitstreams to GCP	0s
CW340 Test ROM Tests / FPGA test	4m 52s
CW340 ROM_EXT Tests / FPGA test	6m 41s
CW340 Manufacturing Tests / FPGA test	42m 19s
CW340 ROM Tests / FPGA test	50s
CW340 SiVal Tests / FPGA test	19m 23s
CW340 SiVal ROM_EXT Tests / FPGA test	4m 0s
Verify FPGA jobs	24s
	10h 7m 51s

Provide feedback