iris: Allow shared scanout buffer to be placed in smem as well

i915 and Xe kmd allows scanout to display of prime buffers placed in smem.

Allowing shared and scanout bos to be placed in smem and lmem allows the dma buf to work in some cases that only lmem is not enough.

Fixes: c10ff197 ("iris: Place scanout buffers only into lmem for discrete GPUs") Closes: #8867 (closed) Closes: #8766 (closed) Signed-off-by: José Roberto de Souza jose.souza@intel.com