Make getAllCellInfo Asynchronous

Update the getAllCellInfo() call to be asynchronous
and support multiple modes. This enables us to add
asynchronous API support in TelephonyManager for
CellInfo and prepares us to deprecate CellLocation.

This also centralizes and homgenizes the behavior of
CellInfo, fixing some of the threading problems with
these APIs. The new behavior is as follows:

-Now whenever the getAllCellInfo() cache is updated
 in the SST, it will invoke the PhoneStateListener
 for all listeners of LISTEN_CELL_INFO.

-getAllCellInfo() now supports a Message parameter
 much like many other invocations on the Phone object.
   -This version is void, so it's unambiguous that
    this version is asynchronous.
   -If a Message object is provided, then the updated
    cell info will be posted as an AsyncResult in the
    message once the response is received from the
    radio.
   -If the message object is null, then the call will
    still query the modem and update the writethrough
    cache in SST and trigger the PhoneStateListener.

-There is now an overload for getAllCellInfo() to
 support synchronous calls on the same thread, which
 will ONLY return the cached value in SST and never
 calls down to the radio. This avoids calls to the
 same method having inconsistent behavior based on
 the calling context.

-getCellLocation() has been updated to use the new
 asynchronous version of getAllCellInfo() to support
 the legacy behavior that queries CellInfo when the
 device isn't registered and location is requested.
 Thus, this method is now also asynchronous, so that
 it is unambigous when calls *may* be made down to
 the modem.

-There is now a synchronous version of getCellLocation
 which will return the cached value in SST
 or attempt to get a cached value from CellInfo stored
 in SST if there is no valid CellIdentity.

Bug: 37100068
Test: atest FrameworksTelephonyTests

Change-Id: I52cd652b350733991bae1457ec07ad1414c5d1dd