hw/mips/fuloong2e: Move code and update a comment

Move the RAM-related call closer to the RAM creation block,
rename the ROM comment.

Reviewed-by: Huacai Chen <chenhc@lemote.com>
Message-id: <20200510210128.18343-4-f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

hw/mips/mips_fulong2e.c

@@ -315,12 +315,11 @@ static void mips_fulong2e_init(MachineState *machine)
         error_report("Invalid RAM size, should be 256MB");
         exit(EXIT_FAILURE);
     }
+    memory_region_add_subregion(address_space_mem, 0, machine->ram);
 
-    /* allocate RAM */
+    /* Boot ROM */
     memory_region_init_rom(bios, NULL, "fulong2e.bios", BIOS_SIZE,
                            &error_fatal);
-
-    memory_region_add_subregion(address_space_mem, 0, machine->ram);
     memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
 
     /*