Remove duplicate generateEekChain routine

Reduce duplicated code, hooray. Also, we'll be adding the real EEK to
the support library, so prepare for that by linking it now.

Bug: 191301285
Test: Manually run rkp_factory_extraction_tool
Change-Id: I7e1695e3a512be01e24f681aa0a369d3482ad383
Merged-In: I7e1695e3a512be01e24f681aa0a369d3482ad383
2 files changed