NDK API coverage

Fixed typo in dist path for backed by.

Test: TARGET_BUILD_APPS=com.android.adbd m dist apps_only

Change-Id: Ic67c0bd5644dec11829f0dc2535016fec788a067
diff --git a/apex/androidmk.go b/apex/androidmk.go
index 832faf2..7764b6b 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -429,7 +429,7 @@
 				}
 
 				distCoverageFiles(w, "ndk_apis_usedby_apex", a.nativeApisUsedByModuleFile.String())
-				distCoverageFiles(w, "ndk_apis_usedby_apex", a.nativeApisBackedByModuleFile.String())
+				distCoverageFiles(w, "ndk_apis_backedby_apex", a.nativeApisBackedByModuleFile.String())
 				distCoverageFiles(w, "java_apis_used_by_apex", a.javaApisUsedByModuleFile.String())
 			}
 		}}