Keystore 2.0 Crypto: export zvec module and provide a ZVec Error.

ZVec now has its own error rather then using the crypto library error.
This makes it easier to move ZVec out of the crypto library in the
future.

Test: N/A
Change-Id: I4788cbbc48281e30729142fb08f5cb94b2d243c2
3 files changed