Remove unused parameters, unused variables, unused functions

Removes warnings after enabling -Wall and -Werror

Test: Boots, NFC Enable/Disable
Change-Id: Ic939464e74792f09886caded9afa2fa5aafaf9f0
diff --git a/src/Android.bp b/src/Android.bp
index 44956be..19725dc 100644
--- a/src/Android.bp
+++ b/src/Android.bp
@@ -25,9 +25,8 @@
     ],
     cflags: [
         "-DBUILDCFG=1",
-        "-Wno-deprecated-register",
-        "-Wno-unused-parameter",
-        "-Wno-missing-field-initializers",
+        "-Wall",
+        "-Werror",
     ],
     local_include_dirs: [
         "include",