svga: add new ATC formats to the format conversion table

Fixes the static assertion error.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
14 jobs for !206 with atc-texture in 18 minutes and 30 seconds (queued for 2 seconds)
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  Containers Build
passed #257663
debian

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  Build+Test
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meson-clang

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meson-gallium-clover-llvm

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meson-gallium-clover-llvm39

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meson-gallium-drivers-other

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meson-gallium-radeonsi

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meson-gallium-st-other

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meson-gallium-swr

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meson-glvnd

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meson-loader-classic-dri

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meson-vulkan

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scons-llvm

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scons-nollvm

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scons-swr

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