[otbn] Define SIMD instructions #18737

Job	Run time
Lint (quick)	2m 46s
Verible lint	1m 15s
Run OTBN smoke Test	2m 36s
Lint (slow)	13m 17s
Run OTBN crypto tests	27m 59s
Airgapped build	18m 45s
Build documentation	4m 54s
CW305's Bitstream	26m 8s
QEMU smoketest	2m 16s
Build and test software	23m 51s
Build Docker Containers	2m 9s
Test QEMU local development override	4m 15s
Earl Grey for CW310 Hyperdebug / Build bitstream	28m 36s
Verilated English Breakfast	5m 45s
Verilated Earl Grey	15m 36s
Earl Grey for CW340 / Build bitstream	28m 59s
Build and test Darjeeling software	18m 9s
CW310 SiVal ROM_EXT Tests	0s
CW310 Test ROM Tests	0s
CW310 Manufacturing Tests	0s
CW310 ROM_EXT Tests	0s
CW310 ROM Tests	0s
CW310 SiVal Tests	0s
CW340 Test ROM Tests	0s
CW340 ROM Tests	0s
CW340 SiVal Tests	0s
CW340 Manufacturing Tests	0s
CW340 SiVal ROM_EXT Tests	0s
Cache bitstreams to GCP	1s
CW340 ROM_EXT Tests	0s
Verify FPGA jobs	1s
Merge blocker	1s
	3h 47m 19s

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