Remove third_party/angle/ from generate_android_bp.py

Android builds are failing due to .git/HEAD being listed in the
Android.bp, which generate_android_bp.py is supposed to remove. The
problem is that the blacklist contains '//third_party/angle/.git/HEAD'
rather than '//.git/HEAD', due to generating the GN files from
chromium/src/ rather than angle/. This CL cleans this up.

Bug: b/160727922
Test: Manual script execution and building in AOSP
Change-Id: Ia1682605097791d20b28686f3043ddc08d49ca52
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2310960
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>

scripts/generate_android_bp.py

@@ -160,7 +160,7 @@ def gn_sources_to_blueprint_sources(sources):
 
 target_blackist = [
     '//build/config:shared_library_deps',
-    '//third_party/angle/third_party/vulkan-validation-layers/src:vulkan_clean_old_validation_layer_objects',
+    '//third_party/vulkan-validation-layers/src:vulkan_clean_old_validation_layer_objects',
 ]
 
 include_blacklist = [
@@ -382,7 +382,7 @@ blueprint_gen_types = {
 
 
 inputs_blacklist = [
-    '//third_party/angle/.git/HEAD',
+    '//.git/HEAD',
 ]
 
 outputs_remap = {