cxgb4: Delete unused file cxgb4/t4fw-1.3.10.0.bin

There doesn't appear to be any driver version that will request the
file "cxgb4/t4fw-1.3.10.0.bin".  The current version requests
"cxgb4/t4fw.bin" which remains as a symlink.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -542,7 +542,6 @@ Found in hex form in kernel source.
 
 Driver: cxgb4 - Chelsio Terminator 4 1G/10G Ethernet adapter
 
-File: cxgb4/t4fw-1.3.10.0.bin
 File: cxgb4/t4fw-1.4.16.0.bin
 
 Licence: Redistributable. See LICENCE.chelsio_firmware for details