bnxt_en: fix stored FW_PSID version masks

The FW_PSID version components are 8 bits wide, not 4.

Fixes: db28b6c7

 ("bnxt_en: Fix devlink info's stored fw.psid version format.")
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>