Move KeyCharacterMap from RefBase to shared_ptr.

Move KeyCharacterMap from RefBase and make it shared_ptr in EventHub
device when loaded from file.
A shared_ptr of KeyCharacterMap is returned by EventHub getKeyCharacterMap
to be shared in InputdeviceInfo.
Remove extra KeyCharacterMap in EventHub to save memory sapce.

Bug: 160010896
Test: atest inputflinger, atest libinput_tests

Change-Id: Ibb317ea0684e6af6e7a6d808f816fc4a05c7b421
diff --git a/include/input/InputDevice.h b/include/input/InputDevice.h
index c7685b7..60638ca 100644
--- a/include/input/InputDevice.h
+++ b/include/input/InputDevice.h
@@ -108,11 +108,11 @@
     inline void setKeyboardType(int32_t keyboardType) { mKeyboardType = keyboardType; }
     inline int32_t getKeyboardType() const { return mKeyboardType; }
 
-    inline void setKeyCharacterMap(const sp<KeyCharacterMap>& value) {
+    inline void setKeyCharacterMap(const std::shared_ptr<KeyCharacterMap> value) {
         mKeyCharacterMap = value;
     }
 
-    inline sp<KeyCharacterMap> getKeyCharacterMap() const {
+    inline const std::shared_ptr<KeyCharacterMap> getKeyCharacterMap() const {
         return mKeyCharacterMap;
     }
 
@@ -136,7 +136,7 @@
     bool mHasMic;
     uint32_t mSources;
     int32_t mKeyboardType;
-    sp<KeyCharacterMap> mKeyCharacterMap;
+    std::shared_ptr<KeyCharacterMap> mKeyCharacterMap;
     bool mHasVibrator;
     bool mHasButtonUnderPad;