lmkd: Enable stricter compiler checks

Enable -Wall and -Wextra compiler flags to catch compilation warnings.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ia802dbd7abb167d66b76390e269e4a4418ca5def

Android.bp

@@ -27,7 +27,12 @@ cc_binary {
         "liblmkd_utils",
     ],
     local_include_dirs: ["include"],
-    cflags: ["-Werror", "-DLMKD_TRACE_KILLS"],
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+        "-DLMKD_TRACE_KILLS"
+    ],
     init_rc: ["lmkd.rc"],
     defaults: ["stats_defaults"],
     logtags: ["event.logtags"],
@@ -39,6 +44,7 @@ cc_library_static {
     cflags: [
         "-Wall",
         "-Werror",
+        "-Wextra",
     ],
     defaults: ["stats_defaults"],
     shared_libs: [