[clang-tidy] Suppress readability-static-access-through-instance for CUDA built-in variables

clang-tidy can be used to statically analyze CUDA code,
thanks to clang being able to compile CUDA code natively.
This makes clang-tidy the one and only open-source
static analyzer for CUDA.

However it currently warns for native CUDA built-in
variables, like threadIdx, due to the way they
are implemented in clang.

Users don't need to know the details of the clang
implementation, and they should continue to write
idiomatic code. Therefore, suppress the warning
if a CUDA built-in variable is encountered.

Fixes https://bugs.llvm.org/show_bug.cgi?id=48758