Add prebuilts/r8

Bug: 65854021
Merged-In: Id7ee927e9a2cd024f0c624ff5f0edc7c18cc0ad6
Change-Id: I5b942e0894e65953d82da429ece942311637713d

default.xml

@@ -569,6 +569,7 @@
   <project path="prebuilts/python/darwin-x86/2.7.5" name="platform/prebuilts/python/darwin-x86/2.7.5" groups="darwin,pdk,pdk-cw-fs,pdk-fs" clone-depth="1" />
   <project path="prebuilts/python/linux-x86/2.7.5" name="platform/prebuilts/python/linux-x86/2.7.5" groups="linux,pdk,pdk-cw-fs,pdk-fs" clone-depth="1" />
   <project path="prebuilts/qemu-kernel" name="platform/prebuilts/qemu-kernel" groups="pdk" clone-depth="1" />
+  <project path="prebuilts/r8" name="platform/prebuilts/r8" groups="pdk"  clone-depth="1" />
   <project path="prebuilts/sdk" name="platform/prebuilts/sdk" groups="pdk"  clone-depth="1" />
   <project path="prebuilts/tools" name="platform/prebuilts/tools" groups="pdk,tools"  clone-depth="1" />
   <project path="sdk" name="platform/sdk" groups="pdk-cw-fs,pdk-fs" />