logd: enable -Wextra

Also drop -Wall and -Werror since they're included by default now.

Test: build
Change-Id: Ib0f33d2f02e00aaf544cb0ce5acec5d8acaa8a81
diff --git a/logd/Android.bp b/logd/Android.bp
index b6d30cd..ea1054d 100644
--- a/logd/Android.bp
+++ b/logd/Android.bp
@@ -52,7 +52,9 @@
 
     export_include_dirs: ["."],
 
-    cflags: ["-Werror"] + event_flag,
+    cflags: [
+        "-Wextra",
+    ] + event_flag,
 }
 
 cc_binary {
@@ -75,7 +77,9 @@
         "libcap",
     ],
 
-    cflags: ["-Werror"],
+    cflags: [
+        "-Wextra",
+    ],
 }
 
 cc_binary {
@@ -90,10 +94,8 @@
     shared_libs: ["libbase"],
 
     cflags: [
-        "-Wall",
+        "-Wconversion",
         "-Wextra",
-        "-Werror",
-        "-Wconversion"
     ],
 }