Qualcomm FastPath is not supported by OpenWrt at all. There are occassionally some users trying to make this patchset work on their devices, but it isn't part of OpenWrt and never will be.
Edit: Just for the avoidance of doubt, this doesn't preclude the possibility that OpenWrt may support hardware offloading on QCA platforms in the future (e.g. the dsa based qca8k switch driver already supports some hardware acceleration for AR8337N, likewise it's not impossible that NSS/ NPU support of ipq806x/ ipq807x may be implemented as a hardware flow-offloading infrastructure), just that QCA FastPath (which is functionally roughly equivalent to software flow-offloading) won't be (flow-offloading made it into mainline - and OpenWrt).