These are need for aarch64 devices

default.xml

@@ -474,8 +474,8 @@
   <!--project path="prebuilts/gcc/darwin-x86/mips/mips64el-linux-android-4.8" name="platform/prebuilts/gcc/darwin-x86/mips/mips64el-linux-android-4.8" groups="pdk,darwin,mips" /> -->
   <!--project path="prebuilts/gcc/darwin-x86/x86/x86_64-linux-android-4.8" name="platform/prebuilts/gcc/darwin-x86/x86/x86_64-linux-android-4.8" groups="pdk,darwin,x86" /> -->
   <!--project path="prebuilts/gcc/darwin-x86/x86/x86_64-linux-android-4.9" name="platform/prebuilts/gcc/darwin-x86/x86/x86_64-linux-android-4.9" groups="pdk,darwin,x86" /> -->
-  <!--project path="prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.8" name="platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.8" groups="pdk,linux,arm" /> -->
-  <!--project path="prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" groups="pdk,linux,arm" /> -->
+  <project path="prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.8" name="platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.8" groups="pdk,linux,arm" />
+  <project path="prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" name="platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9" groups="pdk,linux,arm" />
   <project path="prebuilts/gcc/linux-x86/arm/arm-eabi-4.4.3" name="android_prebuilts_gcc_linux-x86_arm_arm-eabi-4.4.3" groups="pdk,linux,arm" remote="omnirom" revision="android-5.1" />
   <project path="prebuilts/gcc/linux-x86/arm/arm-eabi-4.7" name="android_prebuilts_gcc_linux-x86_arm_arm-eabi-4.7" remote="omnirom" revision="android-5.1" />
   <project path="prebuilts/gcc/linux-x86/arm/arm-eabi-4.8" name="platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8" groups="pdk,linux,arm" />