mpi3mr: Set Driver Capability for OS Exposure in IOCInit

This patch updates the driver to set the OSExposure field in DriverCapability
during IOCInit to MPI3_IOCINIT_DRIVERCAP_OSEXPOSURE_NO_SPECIAL(0x1), aligning
with the latest MPI specification version 36.

Reviewed by: ssaxena, imp
Differential Revision: https://reviews.freebsd.org/D49745