armv8/fsl-lsch3: Use correct compatible for serial clock fixup

The serial nodes in the fsl-lsch3 device trees have compatible =
"fsl,ns16550", "ns16550a" -- so don't look for "ns16550".

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>

arch/arm/cpu/armv8/fsl-lsch3/fdt.c

@@ -62,7 +62,7 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 #endif
 
 #ifdef CONFIG_SYS_NS16550
-	do_fixup_by_compat_u32(blob, "ns16550",
+	do_fixup_by_compat_u32(blob, "fsl,ns16550",
 			       "clock-frequency", CONFIG_SYS_NS16550_CLK, 1);
 #endif
 }