Bump third_party/cores/opentitan from `eec48c4` to `8bf8012`

[dependabot[bot]]

Bumps third_party/cores/opentitan from eec48c4 to 8bf8012.

Commits

• 8bf8012 [i2c dif] Add headers for functions to control i2c device in the dif
• 9d0b319 fix(kmac): Check SHA3 done loosely for false value
• c1308a7 [util] Print stderr if generate_compilation_db.py fails
• 468e69c [flash_ctr,dv] Add more v2s tests
• 5377391 [test] Run additional functests with rom
• 8202f9f [CLOCK group] Fixed some unclear clock groups raised in #5305
• d54b1e0 fix merge skew
• 3731187 [test] Make boot_data_functest compatible with rom
• 0049752 [test] Make pmp_smoketest_tor compatible with ROM
• 8a4ae82 [sw/silicon_creator] Increase stack size to 16 KiB
• Additional commits viewable in compare view

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