iris: Resolve stencil buffer lossless compression with WM_HZ_OP packet

iris: Resolve stencil buffer lossless compression with WM_HZ_OP packet

Even though stencil buffer compression looks like regular lossless color
compression w/o fast clear support, we have to resolve stencil buffer
with WM_HZ_OP packet.

v2: Check if resource is stencil with helper function (Nanley Chery)

v3: Remove unnecessary included file (Nanley Chery)

v4: (Nanley Chery)
- Avoid stencil buffer aux state transition by improving condition check

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>