Trace each config option in RenderEngine's shader priming

This adds minimal tracing overhead compared to the significant tracing
already being done for these draw calls, and may help downstream
developers better understand how each configuration option contributes
to device boot time.

Test: presubmit
Bug: N/A
Flag: NONE trivial debug tracing
Change-Id: I9ed45e3a57223eb6c4f4af78c05c72facb3941ce