cxgb3: Update FW to 7.4.0

Update FW to 7.4.
Bump up driver revision.
Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

WHENCE

@@ -412,7 +412,7 @@ Driver: cxgb3 - Chelsio Terminator 3 1G/10G Ethernet adapter
 
 File: cxgb3/t3b_psram-1.1.0.bin.ihex
 File: cxgb3/t3c_psram-1.1.0.bin.ihex
-file: cxgb3/t3fw-7.1.0.bin.ihex
+file: cxgb3/t3fw-7.4.0.bin.ihex
 
 License: GPLv2 or OpenIB.org BSD license, no source visible