stdlib: Add U74VecFU to U74CPU

This change is to elimilate the warning message from U74CPU.

Change-Id: I7a5d0cd0b2955e54ed14fc1ac6f7127bd7f0604b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71238
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

src/python/gem5/prebuilt/riscvmatched/riscvmatched_core.py

@@ -75,6 +75,10 @@ class U74MiscFU(MinorDefaultMiscFU):
     pass
 
 
+class U74VecFU(MinorDefaultVecFU):
+    pass
+
+
 class U74FUPool(MinorFUPool):
     funcUnits = [
         U74IntFU(),
@@ -86,6 +90,7 @@ class U74FUPool(MinorFUPool):
         U74MemReadFU(),
         U74MemWriteFU(),
         U74MiscFU(),
+        U74VecFU(),
     ]