Initial commit for HID Client

This patch just renames files from existing hid host
which were referred for design while developing
hid client feature.

Orignal files that were renamed to new files are
jni/com_android_bluetooth_hid.cpp and
src/com/android/bluetooth/hid/HidService.java

Change-Id: Id1e00a3f3fa4df5ff81503767907b192fa4c4929