ARM: multi_v7_defconfig: Enable support for Samsung S3C64XX SPI

Build the spi-s3c64xx driver as a module to have support for
the SPI controller in several Samsung SoCs.
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -306,6 +306,7 @@ CONFIG_SPI_OMAP24XX=y
 CONFIG_SPI_ORION=y
 CONFIG_SPI_PL022=y
 CONFIG_SPI_RSPI=y
+CONFIG_SPI_S3C64XX=m
 CONFIG_SPI_SH_MSIOF=m
 CONFIG_SPI_SH_HSPI=y
 CONFIG_SPI_SIRF=y