Mark the SUBSCRIBED_FEEDS_READ/WRITE permissions removed.

These permissions are definded by the platform to protect the
subscribed feeds provider which is not in the system, neither
is its contract specified in the system. Both the contract and
the implementation of the provider are in GmsCore. Hence, this
permissions shuld be declared by GmsCore, not the system. Until
GmsCore adds the permissions we have to keep this as removed
but present in the implementation to keep apps that use the
provider working.

bug:20192150

Change-Id: I3f38b01a159bb430c30948b14de7cdaf5cb50772