arm64: Populate the platform devices

This patch add a device_initcall() to populate the platform devices
(of_default_bus_match_table). This allows SoC implementations that do
not require earlier initcalls to avoid any platform-specific code under
arch/arm64.

GIC and generic timer initialisation is done via FDT and CPU notifiers
independently of the SoC code.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/kernel/setup.c

@@ -39,6 +39,7 @@
 #include <linux/proc_fs.h>
 #include <linux/memblock.h>
 #include <linux/of_fdt.h>
+#include <linux/of_platform.h>
 
 #include <asm/cputype.h>
 #include <asm/elf.h>
@@ -289,6 +290,13 @@ static int __init topology_init(void)
 }
 subsys_initcall(topology_init);
 
+static int __init arm64_device_probe(void)
+{
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	return 0;
+}
+device_initcall(arm64_device_probe);
+
 static const char *hwcap_str[] = {
 	"fp",
 	"asimd",