spi: st-ssc4: Allow compile test build

There is no build dependency for this driver, so enable COMPILE_TEST to get
better build coverage.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 9d8c84b..0619089 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -569,7 +569,7 @@
 
 config SPI_ST_SSC4
 	tristate "STMicroelectronics SPI SSC-based driver"
-	depends on ARCH_STI
+	depends on ARCH_STI || COMPILE_TEST
 	help
 	  STMicroelectronics SoCs support for SPI. If you say yes to
 	  this option, support will be included for the SSC driven SPI.