sf: Fix entries for S25FL256S_256K and S25FL512S_256K

Both of these chips have 256kB big sectors, thus the _256K suffix,
compared to their _64K counterparts, which have 64kB sectors. Also,
they have four times less sectors than their _64K counterparts.

Signed-off-by: Marek Vasut <marex@denx.de>
Tested-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

drivers/mtd/spi/sf_params.c

@@ -55,9 +55,9 @@ const struct spi_flash_params spi_flash_params_table[] = {
 	{"S25FL032P",	   0x010215, 0x4d00,    64 * 1024,    64, RD_FULL,		     WR_QPP},
 	{"S25FL064P",	   0x010216, 0x4d00,    64 * 1024,   128, RD_FULL,		     WR_QPP},
 	{"S25FL128S_64K",  0x012018, 0x4d01,    64 * 1024,   256, RD_FULL,		     WR_QPP},
-	{"S25FL256S_256K", 0x010219, 0x4d00,    64 * 1024,   512, RD_FULL,		     WR_QPP},
+	{"S25FL256S_256K", 0x010219, 0x4d00,   256 * 1024,   128, RD_FULL,		     WR_QPP},
 	{"S25FL256S_64K",  0x010219, 0x4d01,	64 * 1024,   512, RD_FULL,		     WR_QPP},
-	{"S25FL512S_256K", 0x010220, 0x4d00,    64 * 1024,  1024, RD_FULL,		     WR_QPP},
+	{"S25FL512S_256K", 0x010220, 0x4d00,   256 * 1024,   256, RD_FULL,		     WR_QPP},
 	{"S25FL512S_64K",  0x010220, 0x4d01,    64 * 1024,  1024, RD_FULL,		     WR_QPP},
 #endif
 #ifdef CONFIG_SPI_FLASH_STMICRO		/* STMICRO */