target-xtensa: xtfpga: fix FLASH interface width

FLASH chip on XTFPGA boards is connected with 16-bit-wide interface.
Latest U-Boot can see the difference and does not work correctly with
32-bit-wide interface.
Set FLASH chip 'width' property to 2.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>

hw/xtensa/xtfpga.c

@@ -165,7 +165,7 @@ static pflash_t *xtfpga_flash_init(MemoryRegion *address_space,
     qdev_prop_set_uint32(dev, "num-blocks",
                          board->flash_size / board->flash_sector_size);
     qdev_prop_set_uint64(dev, "sector-length", board->flash_sector_size);
-    qdev_prop_set_uint8(dev, "width", 4);
+    qdev_prop_set_uint8(dev, "width", 2);
     qdev_prop_set_bit(dev, "big-endian", be);
     qdev_prop_set_string(dev, "name", "lx60.io.flash");
     qdev_init_nofail(dev);