trusty: Rate limit Trusty logging

Trusty logging can get a bit verbose in certain situations, which can
cause an apparent softlockup if printk is hooked up to e.g. the UART.

Rate limiting this log prevents a system reset in these scenarios.

Bug: 146462789
Change-Id: Idc79957832809df043397d4660cb2952e39ba2a2
Signed-off-by: Matthew Maurer <mmaurer@google.com>