Fix Range-Checking in CellSignalStrengthCdma

The CellSignalStrengthCdma class previously allowed
the values in the class to be kept as negative ints
but expected them to be parceled as positive ints.
This led to a confusing mess that is best unwound
by calling the actual constructor for the class and
letting the parcel values be an implementation detail.
This CL removes all of the parcel-time coersion and
instead expects that the class be constructed using
a constructor rather than by manually parceling and
then using the class to un-parcel. In addition, the
range checking for inputs is now done only once, and
values are no longer mutated in the parcel/unparcel
process.

Bug: 32364031
Test: runtest frameworks-telephony
Change-Id: I59ce8c9df1bd99547f3de941a30d6c3cea8f2b8f