Fix ECC algorithm selection and reporting for keylime agent

[sergio-correia]

• Use AsymmetricAlgorithmSelection instead of AsymmetricAlgorithm to allow ecc521 to properly map to P-521 curve instead of defaulting to P-256
• Change ECC256 algorithm display from generic "ecc" to specific "ecc256"

These changes are required for enabling ECC attestation with the NIST curves.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 58.21%. Comparing base (5e32460) to head (014f809).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
keylime/src/algorithms.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

Flag	Coverage Δ
e2e-testsuite	58.21% <50.00%> (+0.05%)	⬆️
upstream-unit-tests	58.21% <50.00%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
keylime/src/tpm.rs	67.25% <100.00%> (ø)
keylime/src/algorithms.rs	66.66% <0.00%> (ø)

... and 8 files with indirect coverage changes

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[ansasaki]

LGTM!