There are 2 questions here...I noticed the HAL files are not included in the 2.0 of the K22 KSDK and also notice none of the example really use the clock driver other than the structures.
Which HAL files you mean not included in KSDK2.0 for K22? And what do you mean none of the example use the clock driver? Please provide more details.
Here you can find about the HAL and KDSK but about the clock please give more information.
there is an explanation about the HAL.
Introducing Kinetis SDK v2
Retrieving data ...