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

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

Change-Id: I6b29c8c201ab6ec004c0e98c7e90adfae64c6479