Link real IMM_ROM_EXT into ROM_EXT #4755

Job	Run time
Lint (quick)	3m 7s
Lint (slow)	11m 49s
Airgapped build	8m 16s
Run OTBN crypto tests	2m 58s
Build documentation	4m 48s
Run OTBN smoke Test	2m 31s
Verible lint	1m 4s
Verilated Earl Grey	16m 50s
Verilated English Breakfast	7m 35s
Build Docker Containers	2m 52s
CW305's Bitstream	23m 23s
Build and test software	14m 52s
Earl Grey for CW310 / Build bitstream	1h 7m 1s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 10m 38s
Earl Grey for CW340 / Build bitstream	1h 24m 33s
CW310 ROM Tests / FPGA test	18m 21s
CW310 Test ROM Tests / FPGA test	5m 15s
CW310 Manufacturing Tests / FPGA test	13m 46s
CW310 ROM_EXT Tests / FPGA test	11m 56s
CW310 SiVal Tests / FPGA test	13m 46s
CW310 SiVal ROM_EXT Tests / FPGA test	13m 46s
CW340 ROM_EXT Tests	1s
CW340 ROM Tests	1s
Cache bitstreams to GCP	1s
CW340 Manufacturing Tests	1s
CW340 SiVal Tests	1s
CW340 SiVal ROM_EXT Tests	1s
CW340 Test ROM Tests	1s
Verify FPGA jobs	1s
	6h 39m 15s

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