lib: utils: Add a general device tree fix-up helper

This adds a general device tree fix-up helper to do all required
device tree fix-ups for a typical platform.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

lib/utils/fdt/fdt_helper.c

@@ -191,3 +191,10 @@ int fdt_reserved_memory_fixup(void *fdt)
 
 	return 0;
 }
+
+void fdt_fixups(void *fdt)
+{
+	fdt_plic_fixup(fdt, "riscv,plic0");
+
+	fdt_reserved_memory_fixup(fdt);
+}