fix unknown argument: '-ffile-prefix-map by only build default target (…

…#9690)

src/android/CHIPTool/app/build.gradle

@@ -17,6 +17,12 @@ android {
         // NOTE: This build assumes CHIP was configured and built for armeabi-v7a. Deal with
         // other archs later when build is sane.
         //  ndk {abiFilters 'armeabi-v7a'}
+
+        externalNativeBuild {
+            cmake {
+                targets "default"
+            }
+        }
     }
 
     buildTypes {