This produces a non-silenceable warning about enum fields being too small to store all enum values.

Nicolas agreed we can just drop the bitpacking for vulkan state.

Bug: b/123933266
Change-Id: Idf09be3ef122fca70da8d877a211368b7fd8a995
Reviewed-on: https://swiftshader-review.googlesource.com/c/25013Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>