[nrf fromlist] drivers: flash: spi_nor: add define for Quad Enable bit

Quad Enable bit is used to enable/disable 4x line IO in SPI.

Upstream PR #: 85520

Signed-off-by: Marcin Szymczyk <[email protected]>

Author: masz-nordic

drivers/flash/spi_nor.h

@@ -14,6 +14,7 @@
 /* Status register bits */
 #define SPI_NOR_WIP_BIT         BIT(0)  /* Write in progress */
 #define SPI_NOR_WEL_BIT         BIT(1)  /* Write enable latch */
+#define SPI_NOR_QE_BIT          BIT(6)  /* Quad enable */
 
 /* Flash opcodes */
 #define SPI_NOR_CMD_WRSR        0x01    /* Write status register */