This is a follow-up to this cl:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/39748
where filtering was enabled for depth only formats.

According to the Vulkan spec (about
VK_FORMAT_FEATURE_SAMPLED_IMAGE_FILTER_LINEAR_BIT):
"If the format being queried is a depth/stencil format, this bit only
 specifies that the depth aspect (not the stencil aspect) of an image
 of this format supports linear filtering, and that linear filtering
 of the depth aspect is supported whether depth compare is enabled in
 the sampler or not. If this bit is not present, linear filtering
 with depth compare disabled is unsupported and linear filtering with
 depth compare enabled is supported, but may compute the filtered
 value in an implementation-dependent manner which differs from the
 normal rules of linear filtering. The resulting value must be in the
 range [0,1] and should be proportional to, or a weighted average of,
 the number of comparison passes or failures."

So VK_FORMAT_D32_SFLOAT_S8_UINT can be added to the list of
filterable formats, since VK_FORMAT_D32_SFLOAT is already supported.

Change-Id: Ida83c2630c920f3dc2c3e17853dfe91c835a4b7f
Tests: dEQP-VK.*d32_sfloat_s8_uint*
Bug: b/146563038
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40028
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>