of/fdt: move elfcorehdr reservation early for crash dump kernel

elfcorehdr_addr is fixed address passed to Second kernel which may be conflicted
with potential reserved memory in Second kernel,so fdt_reserve_elfcorehdr() ahead
of fdt_init_reserved_mem() can relieve this situation.

Signed-off-by: Nikhil Gupta <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Nikhil Gupta

drivers/of/fdt.c

@@ -648,8 +648,8 @@ void __init early_init_fdt_scan_reserved_mem(void)
 	}
 
 	fdt_scan_reserved_mem();
-	fdt_init_reserved_mem();
 	fdt_reserve_elfcorehdr();
+	fdt_init_reserved_mem();
 }
 
 /**