atl1c: threshold for ASPM is changed based on chip capability

threshold setting to control ASPM for diff chips are different.
currently, all gigabit-capability chips have limited-ASPM under
100M throughput.

Signed-off-by: xiong <xiong@qca.qualcomm.com>
Tested-by: Liu David <dwliu@qca.qualcomm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>