arm64: Use arm64 coherent APIs for non-coherent freeing

the noncoherent free function currently unconditionally frees
back to the page allocator which is incorrect for CMA pages.
call the coherent free function to correctly differentiate
between pages.

Change-Id: I3b5aae3d77bedff9934e090a1e40e8157d4190df
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>