anv: Fix VK_EXT_memory_budget to consider VRAM if available

anv: Fix VK_EXT_memory_budget to consider VRAM if available

Instead of calling the OS query, re-run anv_update_meminfo to get the
latest from either the kernel memory info API or the OS as appropriate.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5173
Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Co-authored-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12433>