Sync with github to support LFS (Large File Storage) for prebuilt binaries

LiteRT-LM-PiperOrigin-RevId: 861722316

Author: protobird-git

.gitattributes

@@ -1,5 +1 @@
-BUILD.llguidance text eol=lf
-prebuilt/*/*.so filter=lfs diff=lfs merge=lfs -text
-prebuilt/*/*.dylib filter=lfs diff=lfs merge=lfs -text
-prebuilt/*/*.dll filter=lfs diff=lfs merge=lfs -text
-prebuilt/*/*.lib filter=lfs diff=lfs merge=lfs -text
+BUILD.llguidance text eol=lf

README.md

@@ -225,14 +225,12 @@ device and your development platform.
 
 > Note: In order to run on GPU on all platforms, we need to take extra steps:
 >
-> 1. Install [Git LFS](https://git-lfs.com), then run `git lfs checkout` to fetch
-  prebuilt binaries. These steps are required only once if not done before.
 > 1. Add `--define=litert_link_capi_so=true`
   `--define=resolve_symbols_in_exec=false` in the build command.
-> 1. `mkdir -p <test_dir>; cp <your litert_lm_main> <test_dir>; cp ./prebuilt/<your OS>/<shared libaries> <test_dir>/`
+> 2. `mkdir -p <test_dir>; cp <your litert_lm_main> <test_dir>; cp ./prebuilt/<your OS>/<shared libaries> <test_dir>/`
  and make sure the prebuilt .so/.dll/.dylib files are in the same directory as
   `litert_lm_main` binary
-> 1. Running GPU on Windows needs DirectXShaderCompiler. See
+> 3. Running GPU on Windows needs DirectXShaderCompiler. See
  [this Note](#windows_gpu) for more details.
 
 <details>