mtd: fsl-quadspi: allow building for other ARCHes with COMPILE_TEST

This driver doesn't actually need ARCH_MXC to compile. Relax the
constraints.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Han xu <han.xu@freescale.com>

drivers/mtd/spi-nor/Kconfig

@@ -23,7 +23,8 @@ config MTD_SPI_NOR_USE_4K_SECTORS
 
 config SPI_FSL_QUADSPI
 	tristate "Freescale Quad SPI controller"
-	depends on ARCH_MXC
+	depends on ARCH_MXC || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  This enables support for the Quad SPI controller in master mode.
 	  This controller does not support generic SPI. It only supports