Fix RIL_CardStatus_v5 Parceling.

The difference between a v5 and v6 CardStatus response is the addition
of ims_subscription_app_index. In previous releases libril added a -1
to the Parcel in its place for transparent handling of GET_SIM_STATUS
everywhere else regardless of v5 or v6 responses, but it was erroneously
removed in change I4e53c6125995064b8ac0cdfc9376ef2cefe69ec8

Change-Id: I078b61d2f6dc28f738e8eb87f51193fa0bd94c7d