Renamed getter according to recent api review feedback.

GetCredentialOption has been renamed to CredentialOption to avoid
awkward getter naming.

Bug: 265809331
CTS-Coverage-Bug: 263109618
API-Coverage-Bug: 263109618
Test: CtsCredentialManagerTestCases
Change-Id: I907af11ee107bfbc36a7216de6143c7759977bf6
2 files changed