Remove wifi.offload from Q compat matrix.

As it turns out, the client side of this HAL was never implemented.
Ideally, we could completely remove the HAL from old compatibility
matrices and remove the HAL from current.txt. However, this would
break some old devices which include an implementation.

Bug: 130080335
Bug: 126892442
Test: build only (checks manifest)
Change-Id: I7205faa719b9566af1b4e56fda083c540d622dff