Do not enforce VNDK on GSI if VNDK version is not set

If ro.vndk.version is not defined, use the namespace configuration
file that does not enforce VNDK restriction.
This is only for GSI.

Bug: 70704112
Test: Flash sailfish with PI and test with PI GSI image
Change-Id: Ic2b41357905ef47a3483b2eff635e8ae239e28aa