ASoC: stm32: change configuration flag

Use a specific flag for SAI and I2S interfaces,
instead of common flag.

Signed-off-by: olivier moysan <olivier.moysan@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig
index a6372de..23600a5 100644
--- a/sound/soc/stm/Kconfig
+++ b/sound/soc/stm/Kconfig
@@ -1,8 +1,21 @@
-menuconfig SND_SOC_STM32
-	tristate "STMicroelectronics STM32 SOC audio support"
+menu "STMicroelectronics STM32 SOC audio support"
+
+config SND_SOC_STM32_SAI
+	tristate "STM32 SAI interface (Serial Audio Interface) support"
 	depends on ARCH_STM32 || COMPILE_TEST
 	depends on SND_SOC
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select REGMAP_MMIO
 	help
-	  Say Y if you want to enable ASoC support for STM32
+	  Say Y if you want to enable SAI for STM32
+
+config SND_SOC_STM32_I2S
+	tristate "STM32 I2S interface (SPI/I2S block) support"
+	depends on ARCH_STM32 || COMPILE_TEST
+	depends on SND_SOC
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	select REGMAP_MMIO
+	help
+	  Say Y if you want to enable I2S for STM32
+
+endmenu