Remove libvorbis; the platform doesn't use it

Bug: 77284393
Test: build
Change-Id: Ic1261f6a8f26c7f4b86b0d9b6df3643b2cc029a3

default.xml

@@ -229,7 +229,6 @@
   <project path="external/libusb" name="platform/external/libusb" groups="pdk" />
   <project path="external/libusb-compat" name="platform/external/libusb-compat" groups="pdk" />
   <project path="external/libvncserver" name="platform/external/libvncserver" groups="pdk" />
-  <project path="external/libvorbis" name="platform/external/libvorbis" groups="pdk" />
   <project path="external/libvpx" name="platform/external/libvpx" groups="pdk" />
   <project path="external/libvterm" name="platform/external/libvterm" groups="pdk" />
   <project path="external/libxcam" name="platform/external/libxcam" groups="pdk" />