Add samsung specific changes

uapi_unpacker.bzl

@@ -0,0 +1,31 @@
+def _uapi_unpacker_impl(ctx):
+    input_tar = ctx.file.kernel_uapi_headers
+    out_dir = ctx.actions.declare_directory(ctx.label.name + "_uapi_headers")
+
+    ctx.actions.run_shell(
+        outputs = [out_dir],
+        inputs = [input_tar],
+        arguments = [input_tar.path, out_dir.path],
+        progress_message = "Unpacking UAPI headers",
+        command = """
+          tar_file="${PWD}/$1"
+          out_dir="${PWD}/$2"
+          mkdir -p "$out_dir"
+          cd "$out_dir"
+          tar --strip-components=2 -xzf "$tar_file"
+        """,
+    )
+
+    return [DefaultInfo(files = depset([out_dir]))]
+
+uapi_unpacker = rule(
+    implementation = _uapi_unpacker_impl,
+    doc = """Unpack `kernel-uapi-headers.tar.gz`""",
+    attrs = {
+        "kernel_uapi_headers": attr.label(
+            allow_single_file = True,
+            mandatory = True,
+            doc = "the kernel_uapi_headers tarball or label",
+        ),
+    },
+)