test/unit/test_tpm2_auth_util: rename password_util to auth_util
test/unit/test_tpm2_auth_util: rename password_util to auth_util

Update to match changed function name in lib/tpm2_auth_util.c.

Signed-off-by: Jonas Witschel <87a164e5d00d5dcdd001e37b34ea8bcd3fc3a172@gmx.de>

01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools