Prevent checking flag in CTS for device before V

Calling a flag check on device prior to V will check for
READ_DEVICE_CONFIG permission.

Test does not have this permission

Bug: 323199303
Fix: 323199303
Test: atest CtsBluetoothTestCases on T devices
Flag: Exempt, Cts test only
Change-Id: I0b60d340dc756b748f526de37c32a7395ce1719e