isl: Implement isl_surf_init() for gen4-gen9

isl: Implement isl_surf_init() for gen4-gen9

This is a big code push. The patch is about 3000 lines.

Function isl_surf_init() calculates the physical layout of a surface.

The implementation is "complete" (but untested) for all 1D, 2D, 3D, and
cube surfaces for gen4 through gen9, except:
    * gen9 1D surfaces
    * gen9 Ys multisampled surfaces
    * auxiliary surfaces (such as hiz, mcs, ccs)