spi: bcm-qspi: don't include linux/mtd/cfi.h

The header isn't actually needed here, but including it leads
to a build warning when CONFIG_MTD is disabled:

include/linux/mtd/cfi.h:76:2: #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work. [-Werror=cpp]

Fixes: fa236a7ef240 (spi: bcm-qspi: Add Broadcom MSPI driver)
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm-qspi.c

@@ -25,7 +25,6 @@
 #include <linux/ioport.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/mtd/cfi.h>
 #include <linux/mtd/spi-nor.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>