[GCC 7.2 BUILD] Optimized TP-Link Archer C7 V2 AC1750 LEDE Firmware

@DjiPi
I discovered that SQM and FastPath are mutually exclusive after a lot of testing.
If you want to use SQM to reduce bufferbloat just disable FP.
If you want to use FP to increase you network throughput don't enable SQM.