NativeHandleWrapper shouldn't return native_handle_t* in const

DuplicateHandle() and TakeHandle() are returning the native_handle_t*
as passing ownership out of the wrapper. Thus the returned pointer
shouldn't be in const.

Bug: 111976433
Test: buffer_hub-test
Change-Id: Ie353046f5b59beab674a81f4490d5de1d4beaa2e
1 file changed