arm: zynq: Handle ENXIO error return value properly

zynq_clk_get_rate() is also returning ENXIO which is not handled now.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynq/clk.c

@@ -94,7 +94,8 @@ int soc_clk_dump(void)
 
 			clk_free(&clk);
 
-			if (rate == (unsigned long)-ENOSYS)
+			if ((rate == (unsigned long)-ENOSYS) ||
+			    (rate == (unsigned long)-ENXIO))
 				printf("%10s%20s\n", name, "unknown");
 			else
 				printf("%10s%20lu\n", name, rate);