Enable java bpf map always in U devices

Having SdkLevel.isAtLeastU() as a default value of
DeviceConfigUtils.isFeatureEnabled could result confusing behavior.
For example, when flag value is pushed to only the T device and the T
device with the flag is ugraded to U, this device could disable java bpf
map while the device keeps the flag value.
This CL prevents above confusing behavior.

Bug: 246218229
Test: atest BpfNetMaps
Change-Id: I615603c337bb94101dccac77ea0e6fa857041259
1 file changed