Code cleanup (13/n)

No need for ACTION_SESSION_UPDATED listener anymore since the intent
will be sent after the session becomes ready or failed.

Bug: 210359798
Test: atest StagedRollbackTest CtsRootRollbackManagerHostTestCases
Change-Id: I479f5266d61e5c3dc2df3b0c910f43ff6b795e3c
1 file changed