Remove external/ARMComputeLibrary

This reverts commit 3e98348b8e61e758cbf4c2075fabd1b161cae6a5.

It's still an empty project, it can be re-added if needed again in the future.

Change-Id: I01a21f1dc1f395d8720ce8b99941a6d991b6c210
Test: treehugger
diff --git a/default.xml b/default.xml
index 1fdfb3c..ed23fe5 100644
--- a/default.xml
+++ b/default.xml
@@ -87,7 +87,6 @@
   <project path="device/sample" name="device/sample" groups="pdk" />
   <project path="device/ti/beagle_x15" name="device/ti/beagle-x15" groups="device,beagle_x15,pdk" />
   <project path="device/ti/beagle_x15-kernel" name="device/ti/beagle-x15-kernel" groups="device,beagle_x15,pdk" clone-depth="1" />
-  <project path="external/ARMComputeLibrary" name="platform/external/ARMComputeLibrary" groups="pdk" />
   <project path="external/aac" name="platform/external/aac" groups="pdk" />
   <project path="external/adeb" name="platform/external/adeb" groups="pdk" />
   <project path="external/adhd" name="platform/external/adhd" groups="pdk" />