Simplify matrix copy constructor/load

bug:22208220

Change-Id: Id096eb8de8da0dd1687d6af9456b16ce2a1a589b
diff --git a/libs/hwui/Matrix.cpp b/libs/hwui/Matrix.cpp
index 061d26a..06e67c0 100644
--- a/libs/hwui/Matrix.cpp
+++ b/libs/hwui/Matrix.cpp
@@ -155,8 +155,7 @@
 }
 
 void Matrix4::load(const Matrix4& v) {
-    memcpy(data, v.data, sizeof(data));
-    mType = v.getType();
+    *this = v;
 }
 
 void Matrix4::load(const SkMatrix& v) {