Update on "[llava] Use huggingface LLaVA instead of depending on third-party/LLaVa"

Currently we depend on third-party/LLaVA for llava model definition.
This is hard to use because we have to pull LLaVA in as a git submodule
and install from there. It also breaks a lot of dependency assumptions.

This PR removes `third-party/LLaVA`, in favor of huggingface llava model
definition.

Differential Revision: [D61200610](https://our.internmc.facebook.com/intern/diff/D61200610)

[ghstack-poisoned]

Author: larryliu0820

.github/workflows/pull.yml

@@ -204,7 +204,7 @@ jobs:
         conda activate "${CONDA_ENV}"
 
         PYTHON_EXECUTABLE=python bash .ci/scripts/setup-linux.sh "cmake"
-        
+
         # install pybind
         bash install_requirements.sh --pybind xnnpack