mpi3mr: Handle Insufficient Power Fault Code

The driver now checks for insufficient power faults during the load
phase and immediately fails initialization instead of retrying.

Additionally, if an insufficient power fault is detected by the watchdog
after the controller is up, the controller is marked as unrecoverable
instead of triggering a reset.

This improves fault handling and avoids unnecessary recovery attempts
in low-power conditions.

Reviewed by: ssaxena, imp
Differential Revision: https://reviews.freebsd.org/D49747