Add ifdef to prevent header being added multiple times.
Add ifdef to prevent header being added multiple times.

Change-Id: I92bb0667bea98e43fca20dceb4fff20e446c03cf

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base