Revert^2 "Update EC_ATTEST_KEY's validity period." This reverts commit c718a1739ddf32496aac26566e97a5afe27e830e. Reason for revert: With ag/38468387, the original changes pass `atest VtsHalIdentityTargetTest`. Bug: 475661238 Bug: 474180902 Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d213043e1e3dcca523892d8950c14d96db6e082e Merged-In: Ic0423be297beacfd55202afefdd1e6645a7c29f7 Change-Id: Ic0423be297beacfd55202afefdd1e6645a7c29f7