Update T3 firmware to 7.11.0

Changes since 7.8.0 (from the official changelog):

- Fixed sporadic interrupt generation for associated CQ when processing
  a local invalidate work request
- Changes to core scheduling to avoid starving requests from the host
  under heavy RDMA Read Request load (e.g. packets to the wire)

- Programmed the tp tx resource limiter in function of the traffic (only
  affects iWarp)

- Increased the egress NIC gather list length from 36 to 46 entries

MFC after:	1 week

sys/dev/cxgb/common/cxgb_common.h

@@ -96,7 +96,7 @@ enum {
 
 enum {
 	FW_VERSION_MAJOR = 7,
-	FW_VERSION_MINOR = 8,
+	FW_VERSION_MINOR = 11,
 	FW_VERSION_MICRO = 0
 };