VK_FORMAT_B10G11R11_UFLOAT_PACK32 is a mandatory uniform texel buffer
format, which we claimed support for, but the implementation was
missing.

Bug: b/159561781
Change-Id: I47a1aa3d4f371603e4d97e85526e10677753b9ca
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/46008
Presubmit-Ready: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>