armv8: fsl-lsch3: fixup SYSCLK frequency in device tree

SYSCLK frequency is dependent on on-board switch settings. It may
vary as per requirement. boot-loader is aware of board switch
configurations.

So Fixup Linux device tree from boot-loader.
Signed-off-by: NPrabhakar Kushwaha <prabhakar@freescale.com>
CC: Mingkai Hu <Mingkai.Hu@freescale.com>
Reviewed-by: NYork Sun <york.sun@nxp.com>

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

@@ -190,6 +190,9 @@ void ft_cpu_setup(void *blob, bd_t *bd)
 			       "clock-frequency", CONFIG_SYS_NS16550_CLK, 1);
 #endif
 
+	do_fixup_by_compat_u32(blob, "fixed-clock",
+			       "clock-frequency", CONFIG_SYS_CLK_FREQ, 1);
+
 #ifdef CONFIG_PCI
 	ft_pci_setup(blob, bd);
 #endif