Add GWP-ASan to AOSP manifest.

Bug: 139531572
Bug: 135634846
Test: N/A
Change-Id: I8e3a15cfb62faf274ecafbe4ce4cd303efdac559

default.xml

@@ -179,6 +179,7 @@
   <project path="external/grpc-grpc-java" name="platform/external/grpc-grpc-java" groups="pdk,tradefed" />
   <project path="external/guava" name="platform/external/guava" groups="pdk" />
   <project path="external/guice" name="platform/external/guice" groups="pdk" />
+  <project path="external/gwp_asan" name="platform/external/gwp_asan" groups="pdk" />
   <project path="external/hamcrest" name="platform/external/hamcrest" groups="pdk" />
   <project path="external/harfbuzz_ng" name="platform/external/harfbuzz_ng" groups="pdk,qcom_msm8x26" />
   <project path="external/honggfuzz" name="platform/external/honggfuzz" groups="pdk" />