gn2bp: Support MTE in arm64 to fix build error

Test: lunch aosp_arm64 && m cronet_aml_components_cronet_android_cronet
Change-Id: I73b92b96175689f649e0bba04db0fbb1f38d0c5e
diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 60caa1d..50bb9b9 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -641,6 +641,7 @@
                 "-DANDROID",
                 "-DANDROID_NDK_VERSION_ROLL=r23_1",
                 "-DHAVE_SYS_UIO_H",
+                "-march=armv8-a+memtag",
             ],
             local_include_dirs: [
                 "third_party/android_ndk/sources/android/cpufeatures/",