spi: Add Cadence QSPI controller Kconfig entry

Add Cadence QSPI controller Kconfig entry.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Acked-by: Pavel Machek <pavel@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Stefan Roese <sr@denx.de>
Cc: Tom Rini <trini@konsulko.com>
Cc: Vince Bridgers <vbridger@opensource.altera.com>

drivers/spi/Kconfig

@@ -43,3 +43,11 @@ config DESIGNWARE_SPI
 	  Enable the Designware SPI driver. This driver can be used to
 	  access the SPI NOR flash on platforms embedding this Designware
 	  IP core.
+
+config CADENCE_QSPI
+	bool "Cadence QSPI driver"
+	depends on DM_SPI
+	help
+	  Enable the Cadence Quad-SPI (QSPI) driver. This driver can be
+	  used to access the SPI NOR flash on platforms embedding this
+	  Cadence IP core.