Remove unused liblzf

Test: cs/liblzf -file:external/liblzf
Change-Id: Ia6605094935045272756e6a662eb5272a01dea80
Merged-In: Ia6605094935045272756e6a662eb5272a01dea80

default.xml

@@ -223,7 +223,6 @@
   <project path="external/libhevc" name="platform/external/libhevc" groups="pdk,pdk-fs" />
   <project path="external/libjpeg-turbo" name="platform/external/libjpeg-turbo" groups="pdk" />
   <project path="external/libldac" name="platform/external/libldac" groups="pdk" />
-  <project path="external/liblzf" name="platform/external/liblzf" groups="pdk" />
   <project path="external/libmicrohttpd" name="platform/external/libmicrohttpd" />
   <project path="external/libmojo" name="platform/external/libmojo" />
   <project path="external/libmpeg2" name="platform/external/libmpeg2" groups="pdk" />