FEAT-30761 - Adding defaults to all Switch cases in PalDevice gfx detection.

Change-Id: Ic998dba44d3287484d6b0da4f07f320de8e6d92b

rocclr/device/pal/paldevice.cpp

@@ -202,6 +202,9 @@ bool NullDevice::init() {
           case 4:
             ShouldNotReachHere();
             break;
+          default:
+            ShouldNotReachHere();
+            break;
         }
         break;
       case 11:
@@ -209,8 +212,14 @@ bool NullDevice::init() {
           case 0:
             ShouldNotReachHere();
             break;
+          default:
+            ShouldNotReachHere();
+            break;
         }
         break;
+      default:
+        ShouldNotReachHere();
+        break;
     }
 
     Pal::AsicRevision revision = Pal::AsicRevision::Unknown;