atomisp: remove hmm_load/store/clear indirections

We have a layer of un-needed wrapping here that can go. In addition there are
some functions that don't exist and one that isn't used which can also go.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>