drivers: sensor: lsm6dso: Fix issue lsm6dso32 cannot enabled

The lsm6dso driver does not correctly reflect the status of
the node in dt. So the driver didn't compile even if
`st,lsm6dso32` node exists.

I fixed it to correctly go through ithe compile.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>