powerpc/pseries/mobility: add missing break to default case

update_dt_node() has a switch statement where the default case lacks a
break statement.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207215200.1785968-9-nathanl@linux.ibm.com

arch/powerpc/platforms/pseries/mobility.c

@@ -213,6 +213,7 @@ static int update_dt_node(__be32 phandle, s32 scope)
 				}
 
 				prop_data += vd;
+				break;
 			}
 
 			cond_resched();