api: Allow updating VM settings when custom contrained offering is used (#6136)

Author: Pearl1594

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -2647,7 +2647,9 @@ private void verifyVmLimits(UserVmVO vmInstance, Map<String, String> details) {
             Map<String, String> customParameters = new HashMap<>();
             customParameters.put(VmDetailConstants.CPU_NUMBER, String.valueOf(newCpu));
             customParameters.put(VmDetailConstants.MEMORY, String.valueOf(newMemory));
-            customParameters.put(VmDetailConstants.CPU_SPEED, details.get(VmDetailConstants.CPU_SPEED));
+            if (svcOffering.isCustomCpuSpeedSupported()) {
+                customParameters.put(VmDetailConstants.CPU_SPEED, details.get(VmDetailConstants.CPU_SPEED));
+            }
             validateCustomParameters(svcOffering, customParameters);
         }
         if (VirtualMachineManager.ResourceCountRunningVMsonly.value()) {