Initialize mAffineTransform and update on modification

This patch causes the InputReader to update its mAffineTransform to reflect
the currently-set calibration on startup and whenever its value is changed
through the InputManagerService.

Change-Id: I4719122a28afa9833772040f0433780a84240b9d
diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index aaa973d..140d169 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -173,6 +173,10 @@
         return mInputDevices;
     }
 
+    TouchAffineTransformation getTouchAffineTransformation(const String8& inputDeviceDescriptor) {
+        return TouchAffineTransformation();
+    }
+
 private:
     virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) {
         *outConfig = mConfig;