linux-firmware: bnx2: Update mips firmware to fix iSCSI problems

New firmware fixes iSCSI problems with some LeftHand targets that don't
set TTT=0xffffffff for Data-In according to spec.  Firmware generates
exception warnings for this condition and becomes very slow.  This is
fixed by suppressing these warnings when using default error mask.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -1063,12 +1063,14 @@ File: bnx2/bnx2-mips-06-5.0.0.j3.fw
 File: bnx2/bnx2-mips-06-5.0.0.j6.fw
 File: bnx2/bnx2-mips-06-6.0.15.fw
 File: bnx2/bnx2-mips-06-6.2.1.fw
+File: bnx2/bnx2-mips-06-6.2.3.fw
 File: bnx2/bnx2-mips-09-4.6.17.fw
 File: bnx2/bnx2-mips-09-5.0.0.j3.fw
 File: bnx2/bnx2-mips-09-5.0.0.j9.fw
 File: bnx2/bnx2-mips-09-6.0.17.fw
 File: bnx2/bnx2-mips-09-6.2.1.fw
 File: bnx2/bnx2-mips-09-6.2.1a.fw
+File: bnx2/bnx2-mips-09-6.2.1b.fw
 File: bnx2/bnx2-rv2p-06-4.6.16.fw
 File: bnx2/bnx2-rv2p-06-5.0.0.j3.fw
 File: bnx2/bnx2-rv2p-06-6.0.15.fw