[cov,test] Fix hardcoded flash layout constants #18701

Job	Run time
Lint (quick)	3m 46s
Airgapped build	24m 47s
Lint (slow)	11m 41s
Build documentation	5m 38s
Verilated Earl Grey	1h 23m 24s
Run OTBN crypto tests	24m 5s
CW305's Bitstream	12m 17s
Run OTBN smoke Test	2m 41s
Build and test software	30m 15s
Verilated English Breakfast	8m 34s
Verible lint	1m 2s
Build Docker Containers	2m 52s
QEMU smoketest	2m 23s
Earl Grey for CW340 / Build bitstream	1m 34s
Earl Grey for CW310 / Build bitstream	1m 41s
Test QEMU local development override	5m 10s
Earl Grey for CW310 Hyperdebug / Build bitstream	1m 31s
CW310 ROM_EXT Tests / FPGA test	5m 48s
CW310 ROM Tests / FPGA test	51m 28s
CW310 Test ROM Tests / FPGA test	4m 27s
CW340 Manufacturing Tests / FPGA test	44m 47s
CW340 SiVal ROM_EXT Tests / FPGA test	10m 39s
CW340 SiVal Tests / FPGA test	4m 2s
CW340 ROM Tests / FPGA test	1m 4s
CW340 Test ROM Tests / FPGA test	1m 10s
CW340 ROM_EXT Tests / FPGA test	4m 59s
CW310 SiVal Tests / FPGA test	36m 51s
CW310 SiVal ROM_EXT Tests / FPGA test	31m 22s
Hyper310 ROM_EXT Tests / FPGA test	50m 48s
CW310 Manufacturing Tests / FPGA test	34m 6s
Cache bitstreams to GCP	0s
Verify FPGA jobs	36s
	8h 25m 28s

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