anv/image: Set different usage flags for shadow surfaces
For the block BLOCK_TEXEL_VIEW_COMPATIBLE case, this didn't matter because the flags were already more-or-less what we wanted. However, for gen7 stencil shadow images, it still had ISL_SURF_USAGE_STENCIL_BIT so we were getting W-tiled which isn't what we want for the shadow. By passing just ISL_SURF_USAGE_TEXTURE_BIT (and CUBE if we care), we now get something that's actually texturable. Fixes: f3ea0cf8 "anv: Add stencil texturing support for gen7"
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