Common testcase directories: Clean up duplicates

This CL addresses the problem that native tests build for multiple
architectures and also build for host.

First it restructures each testcase folder to the following layout:
<testcase>/<testcase>.config
<testcase>/<arch 1>/testcase
<testcase>/<arch 2>/testcase

Secondly it now uses the new soong-zip prefix capability to
separate out host and target testcases in the device-tests &
general-tests zip files.

Bug:36692141
Test: `make device-tests general-tests cts -j` &
      ensured all built successfully.

Change-Id: I4e8b084ee56fa8940914911649ff35507d87eb27
diff --git a/core/definitions.mk b/core/definitions.mk
index 07a8948..d1a6331 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -3243,11 +3243,12 @@
 ## Compatibility suite tools
 ###########################################################
 
-# Return a list of output directories for a given suite and the current LOCAL_MODULE
+# Return a list of output directories for a given suite and the current LOCAL_MODULE.
+# Can be passed a subdirectory to use for the common testcase directory.
 define compatibility_suite_dirs
   $(strip \
     $(COMPATIBILITY_TESTCASES_OUT_$(1)) \
-    $($(my_prefix)OUT_TESTCASES)/$(LOCAL_MODULE))
+    $($(my_prefix)OUT_TESTCASES)/$(LOCAL_MODULE)$(2))
 endef
 
 # For each suite: