mtd: spi-nor: hisi-sfc: Drop nor->erase NULL assignment

The pointer to 'struct spi_nor' is kzalloc'ed above in the code.
Signed-off-by: NTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: NBoris Brezillon <boris.brezillon@collabora.com>

drivers/mtd/spi-nor/hisi-sfc.c

@@ -364,7 +364,6 @@ static int hisi_spi_nor_register(struct device_node *np,
 	nor->write_reg = hisi_spi_nor_write_reg;
 	nor->read = hisi_spi_nor_read;
 	nor->write = hisi_spi_nor_write;
-	nor->erase = NULL;
 	ret = spi_nor_scan(nor, NULL, &hwcaps);
 	if (ret)
 		return ret;