sf: Add ISSI IS25LP256 entry

Add entry for ISSI IS25LP256 part.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Jagan Teki <jagan@openedev.com>

drivers/mtd/spi/spi_flash_ids.c

@@ -71,6 +71,7 @@ const struct spi_flash_info spi_flash_ids[] = {
 	{"is25lp032",	   INFO(0x9d6016, 0x0, 64 * 1024,    64, 0) },
 	{"is25lp064",	   INFO(0x9d6017, 0x0, 64 * 1024,   128, 0) },
 	{"is25lp128",	   INFO(0x9d6018, 0x0, 64 * 1024,   256, 0) },
+	{"is25lp256",	   INFO(0x9d6019, 0x0, 64 * 1024,   512, 0) },
 #endif
 #ifdef CONFIG_SPI_FLASH_MACRONIX	/* MACRONIX */
 	{"mx25l2006e",	   INFO(0xc22012, 0x0, 64 * 1024,     4, 0) },