Revert 59dfb2e. AOSP 15 KeyMint reference TA at
system/keymint/common/src/tag/info.rs:61-89 lists both Tag::EcCurve
and Tag::KeySize in KEYMINT_ENFORCED_CHARACTERISTICS, and
check_ec_params at common/src/tag.rs:632 says "Key size is not
needed, but if present should match the curve" -- the TA passes
through whatever the caller supplies and keystore2 supplies both
for EC keys per KeyMintBenchmark.cpp:234,259. Omitting KEY_SIZE
made the simulator's characteristics list shorter than real
hardware, a detection fingerprint.
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