sf: new Macronix MX25xx SPI flash driver

Added macronix SF driver for MTD framework
MX25L12805D is supported and tested
TBD: sector erase implementation, other deivces support

Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 274895a..0c83231 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -134,6 +134,11 @@
 		flash = spi_flash_probe_atmel(spi, idcode);
 		break;
 #endif
+#ifdef CONFIG_SPI_FLASH_MACRONIX
+	case 0xc2:
+		flash = spi_flash_probe_macronix(spi, idcode);
+		break;
+#endif
 #ifdef CONFIG_SPI_FLASH_STMICRO
 	case 0x20:
 		flash = spi_flash_probe_stmicro(spi, idcode);