Make the uapi test names consistent

The uapi tests should all be prefixed with `test_i915_uapi_`.

tests/tests_uapi.rs

@@ -40,7 +40,7 @@ fn test_i915_uapi_native_engine_info() {
 }
 
 #[test]
-fn test_i915_find_fd() {
+fn test_i915_uapi_find_fd() {
     let fd = i915::find_fd().expect("Failed to find i915 fd");
     let drm_version = uapi::get_drm_version(fd.as_raw_fd()).expect("Failed to get drm version");
     assert_eq!(drm_version.name.to_str().unwrap(), "i915");