misc: Use python f-strings for string formatting

This patch has been generated by applying flynt to the
gem5 repo (ext has been excluded)

JIRA: https://gem5.atlassian.net/browse/GEM5-831

Change-Id: I0935db6223d5426b99515959bde78e374cbadb04
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68957
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>

src/cpu/BaseCPU.py

@@ -172,13 +172,13 @@ class BaseCPU(ClockedObject):
 
     def connectCachedPorts(self, in_ports):
         for p in self._cached_ports:
-            exec("self.%s = in_ports" % p)
+            exec(f"self.{p} = in_ports")
 
     def connectUncachedPorts(self, in_ports, out_ports):
         for p in self._uncached_interrupt_response_ports:
-            exec("self.%s = out_ports" % p)
+            exec(f"self.{p} = out_ports")
         for p in self._uncached_interrupt_request_ports:
-            exec("self.%s = in_ports" % p)
+            exec(f"self.{p} = in_ports")
 
     def connectAllPorts(self, cached_in, uncached_in, uncached_out):
         self.connectCachedPorts(cached_in)
@@ -267,7 +267,7 @@ class BaseCPU(ClockedObject):
         # Generate cpu nodes
         for i in range(int(self.numThreads)):
             reg = (int(self.socket_id) << 8) + int(self.cpu_id) + i
-            node = FdtNode("cpu@%x" % reg)
+            node = FdtNode(f"cpu@{reg:x}")
             node.append(FdtPropertyStrings("device_type", "cpu"))
             node.appendCompatible(["gem5,arm-cpu"])
             node.append(FdtPropertyWords("reg", state.CPUAddrCells(reg)))

src/cpu/testers/traffic_gen/BaseTrafficGen.py

@@ -117,7 +117,7 @@ class BaseTrafficGen(ClockedObject):
     def connectCachedPorts(self, in_ports):
         if hasattr(self, "_cached_ports") and (len(self._cached_ports) > 0):
             for p in self._cached_ports:
-                exec("self.%s = in_ports" % p)
+                exec(f"self.{p} = in_ports")
         else:
             self.port = in_ports