Update getInterfaceVersion checks to include -1

getInterfaceVersion() returns -1 if it is unknown.

V1 of the HAL doesn't implement getInterfaceVersion
due to ABI reasons for regular, unversioned, AIDL
interfaces.

Bug: 206670536
Test: on device
Change-Id: I358fe2748b4a8450b68d0954dee0814fe246eb18