Connect fingerprint build flag to v2.

If RELEASE_FINGERPRINT_ACONFIG_PACKAGE is enabled, the storage file
version arg supplied to aconfig create-storage will be v2. Otherwise,
send v1 (current default).

As the build flag is not enabled, this change should be a no-op.
Confirmed by building that the files were still v1.

Test: manual
Change-Id: I2e3ef14c5a61bd1cbb2868f01a554af4d9e2a84b