CTS-V: Disable BLE Precision tests on older devices

Even though BLE support is declared, certain older devices do not
have the ability to capture the advertised BLE signals.

Hence, disable BLE Rssi and RxTxOffset Precision tests on devices
launching with Android P or old.

Bug: 401485106
Test: Observe both tests are not visible on pre-Q launch devices
Change-Id: Ied5184afd2f9844162d45a9029d01f1122b7938f
2 files changed