Method configDchPS

Create the simplest TFS and TFCS we can for a DCH for PS [internet] services. The only thing the dch knows a-priori is the spreading factor. If the requested ulTBSize or dlTBSize is 0, make a trivial TFCS with just one block of the maximum size that will fit in the TTI and SF, otherise (it is non-zero) make a TFCS with as many TB of that size as will fit in the TTI and SF. Return true if we could