As per PIT documentation:
37.1.2 Features
The main features of this block are:
Ability of timers to generate DMA trigger pulses
Ability of timers to generate interrupts
Maskable interrupts
Independent timeout periods for each timer

However, reading further, there is no more mention of DMA anywhere in the PIT chapter, and I fail to see how the PIT is connected to the DMA.
Is that just OR-ing SIM_SCGC6 to SIM_SCGC6_PIT instead of SIM_SCGC6_DMAMUX?