intel: fix subslice computation from topology data

We're missing the offset of the slice in the subslice mask...

This worked for most platforms that don't have first slice fused off because we would reread the same mask from slice0 again and again...

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: c1900f5b ("intel: devinfo: add helper functions to fill fusing masks values") Gitlab: #1869 (closed)