Remove unused loads from xplat.

Summary:
Unused loads still take time to process and pollute
execution environment.

drop-conflicts

Reviewed By: passy

Differential Revision: D13054018

fbshipit-source-id: a8fe58d1c55c031925c2c0267e24e67f021cd91d

Author: ttsugriy

ReactAndroid/src/main/third-party/android/support/BUCK

@@ -1,5 +1,5 @@
 load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
-load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "rn_android_library", "rn_android_resource", "rn_prebuilt_jar")
+load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "rn_android_library")
 
 rn_android_library(
     name = "support-v4",

ReactAndroid/src/test/java/com/facebook/react/uimanager/layoutanimation/BUCK

@@ -1,4 +1,4 @@
-load("//tools/build_defs/oss:rn_defs.bzl", "YOGA_TARGET", "react_native_dep", "react_native_target", "react_native_tests_target", "rn_robolectric_test")
+load("//tools/build_defs/oss:rn_defs.bzl", "YOGA_TARGET", "react_native_dep", "react_native_target", "rn_robolectric_test")
 
 rn_robolectric_test(
     name = "layoutanimation",