setParcelable uses const ref instead of pointer

ParcelableHolder for NDK backend doesn't store raw parcelable, so it
doesn't need pointer as argument. So just let it const ref, and add
reset() method for clearing the object.

Test: atest CtsNdkBinderTestCases
Bug: 173682656
Change-Id: I402e4e832585aba62d254f1c603c29454013d3c4
1 file changed