fm10k: prefer READ_ONCE instead of ACCESS_ONCE

fm10k: prefer READ_ONCE instead of ACCESS_ONCE

While technically not needed, as all our uses of ACCESS_ONCE are scalar
types, we already use READ_ONCE in a few places, and for code
readability we can swap all the uses of the older ACCESS_ONCE into
READ_ONCE.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Orabug: 25394529
(cherry picked from commit ce4dad2ce231aa5258ddfc98f8a80d958643c014)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>