Define coverage paths using comma-separated list.

Change COVERAGE_PATHS to access a comma-separated list of paths
instead of a space-separated list to make for easier escaping in
configuration files.

Test: tested using local bullhead build with coverage on lights and nfc
Change-Id: Iec014c8b4fbefcbcc5d865e6acba92bf6364ee3a
diff --git a/core/binary.mk b/core/binary.mk
index aca32d7..3b88926 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -58,7 +58,7 @@
 my_export_c_include_dirs := $(LOCAL_EXPORT_C_INCLUDE_DIRS)
 my_export_c_include_deps := $(LOCAL_EXPORT_C_INCLUDE_DEPS)
 
-ifneq (,$(strip $(foreach dir,$(COVERAGE_PATHS),$(filter $(dir)%,$(LOCAL_PATH)))))
+ifneq (,$(strip $(foreach dir,$(subst $(comma),$(space),$(COVERAGE_PATHS)),$(filter $(dir)%,$(LOCAL_PATH)))))
   my_native_coverage := true
 else
   my_native_coverage := false