drm/vmwgfx: support SVGA_3D_CMD_DX_DEFINE_RASTERIZER_STATE_V2 command

This is going to be required for setting the sample count when
rendering with no attachments.
Also cleans up view handling (should fix depthstencil_v2).

Reviewed-by: Charmaine Lee <charmainel@vmware.com>
Signed-off-by: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-8-zack@kde.org