Update PIEX from tip of tree am: 79ea86a6a1 am: 3f7e2a1cb2 am: 940f4ce6b5 am: 795c25ac50 am: 4579b759f7

Original change: https://android-review.googlesource.com/c/platform/external/piex/+/2037563

Change-Id: I8d59f2891f50f357483d634ed93e47807fb36f05