powerpc/85xx: Adds Support for P2020RDB-PC board

P2020RDB-PC Board shares the same design(PCB) as P102x RDB style platforms.
The difference between this platform and the already existing P2020RDB
is mainly with respect to DDR. The P2020RDB-PC has a DDR3 memory.
The P2020RDB-PC also has a CPLD device connected to local bus.

The main differences from the P102x RDB-PC is 64-bit DDR and SYSCLK of
100Mhz.

Signed-off-by: Prabhakar Kushwaha <[e-mail]>
Signed-off-by: Poonam Aggrwal <[e-mail]>
Signed-off-by: Tang Yuantian <[e-mail]>
Signed-off-by: Kumar Gala <[e-mail]>

arch/powerpc/platforms/85xx/mpc85xx_rdb.c

···
 }
 
 machine_device_initcall(p2020_rdb, mpc85xx_common_publish_devices);
+machine_device_initcall(p2020_rdb_pc, mpc85xx_common_publish_devices);
 machine_device_initcall(p1020_rdb, mpc85xx_common_publish_devices);
 machine_device_initcall(p1021_rdb_pc, mpc85xx_common_publish_devices);
 
···
 	unsigned long root = of_get_flat_dt_root();
 
 	if (of_flat_dt_is_compatible(root, "fsl,P1021RDB-PC"))
+		return 1;
+	return 0;
+}
+
+static int __init p2020_rdb_pc_probe(void)
+{
+	unsigned long root = of_get_flat_dt_root();
+
+	if (of_flat_dt_is_compatible(root, "fsl,P2020RDB-PC"))
 		return 1;
 	return 0;
 }
···
 define_machine(p1021_rdb_pc) {
 	.name			= "P1021 RDB-PC",
 	.probe			= p1021_rdb_pc_probe,
+	.setup_arch		= mpc85xx_rdb_setup_arch,
+	.init_IRQ		= mpc85xx_rdb_pic_init,
+#ifdef CONFIG_PCI
+	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
+#endif
+	.get_irq		= mpic_get_irq,
+	.restart		= fsl_rstcr_restart,
+	.calibrate_decr		= generic_calibrate_decr,
+	.progress		= udbg_progress,
+};
+
+define_machine(p2020_rdb_pc) {
+	.name			= "P2020RDB-PC",
+	.probe			= p2020_rdb_pc_probe,
 	.setup_arch		= mpc85xx_rdb_setup_arch,
 	.init_IRQ		= mpc85xx_rdb_pic_init,
 #ifdef CONFIG_PCI