spi: Build coverage cleanups and improvements

Merge series from Mark Brown <broonie@kernel.org>:

This series opens up build coverage of a bunch of SPI drivers by
allowing build under COMPILE_TEST where possible, while also adding
appropriate architecture specific dependencies to a couple of drivers
that didn't have them so they don't show up in builds when they're not
useful.  We also have one fix for the dependencies of the s3c24xx driver
which was turned up in the process of doing this.

drivers/spi/Kconfig

@@ -276,7 +276,7 @@ config SPI_COLDFIRE_QSPI
 
 config SPI_DAVINCI
 	tristate "Texas Instruments DaVinci/DA8x/OMAP-L/AM1x SoC SPI controller"
-	depends on ARCH_DAVINCI || ARCH_KEYSTONE
+	depends on ARCH_DAVINCI || ARCH_KEYSTONE || COMPILE_TEST
 	select SPI_BITBANG
 	help
 	  SPI master controller for DaVinci/DA8x/OMAP-L/AM1x SPI modules.
@@ -357,7 +357,7 @@ config SPI_FALCON
 
 config SPI_FSI
 	tristate "FSI SPI driver"
-	depends on FSI
+	depends on FSI || COMPILE_TEST
 	help
 	  This enables support for the driver for FSI bus attached SPI
 	  controllers.
@@ -406,7 +406,8 @@ config SPI_HISI_SFC_V3XX
 
 config SPI_NXP_FLEXSPI
 	tristate "NXP Flex SPI controller"
-	depends on ARCH_LAYERSCAPE || HAS_IOMEM
+	depends on ARCH_LAYERSCAPE || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  This enables support for the Flex SPI controller in master mode.
 	  Up to four slave devices can be connected on two buses with two
@@ -777,6 +778,7 @@ config SPI_PXA2XX_PCI
 
 config SPI_ROCKCHIP
 	tristate "Rockchip SPI controller driver"
+	depends on ARCH_ROCKCHIP || COMPILE_TEST
 	help
 	  This selects a driver for Rockchip SPI controller.
 
@@ -818,7 +820,7 @@ config SPI_RSPI
 
 config SPI_QCOM_QSPI
 	tristate "QTI QSPI controller"
-	depends on ARCH_QCOM
+	depends on ARCH_QCOM || COMPILE_TEST
 	help
 	  QSPI(Quad SPI) driver for Qualcomm QSPI controller.