Keymaster: Fix potential bug in extractUint32()/extractUint64()

In deserializeVerificationToken(), we use extractUint64() to extract
VerificationToken.challenge. A potential bug was found in
extractUint64() that will cause VerificationToken.challenge()
incorrect.

Bug: 160198696
Change-Id: Ie0d2c0127cc34f1bb90455e4f7869e15e5542173
1 file changed