cfi02: Fix lazy ROMD switching - once again

The conversion to memory regions broke lazy ROMD switching by forgetting
to update the rom_mode state variable.
Signed-off-by: NJan Kiszka <jan.kiszka@web.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

hw/pflash_cfi02.c

@@ -102,6 +102,7 @@ static void pflash_setup_mappings(pflash_t *pfl)
 static void pflash_register_memory(pflash_t *pfl, int rom_mode)
 {
     memory_region_rom_device_set_readable(&pfl->orig_mem, rom_mode);
+    pfl->rom_mode = rom_mode;
 }
 
 static void pflash_timer (void *opaque)