Update javadoc in IBackupAgent.aidl

Remove the token param from the doBackup() javadoc since the token
parameter no longer exists, and change the quota params to match the
actual parameter name.

Bug: 136795960
Test: Did not run tests, this is just a Javadoc change
Change-Id: Ife2ab3a0cf11ebea9bf74581d706322c01ad6f1c
1 file changed