[bootloader] utils.h becomes xefi.h, helper functions renamed Change-Id: I395ce58f9272b4b6cea4dd9103acf1938737e2af
[bootloader] Initial import of gigaboot Original source: https://fuchsia.googlesource.com/gigaboot20x6/ Upstream commit: 80eef665f1e248eafe48f9b430fdae702ece20c1 Change-Id: I1be9ad20831e0d790937446febc28755943884a5