Whitelist updatePCR from fsanitize=integer

updatePCR does some math to compute transport rate for logging that can
cause an unsigned overflow. Since this is harmless and only for logging
whitelist the function as its otherwise safe from integer issues.

Bug:23110888

Change-Id: I0686afeef99ccf636701d687e5628ae057f60e4c
(cherry picked from commit c9fa35cf)