ASoC: stm32: change configuration flag

Use a specific flag for SAI and I2S interfaces,
instead of common flag.
Signed-off-by: Nolivier moysan <olivier.moysan@st.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/stm/Kconfig

-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

sound/soc/stm/Makefile

 # SAI
 snd-soc-stm32-sai-sub-objs := stm32_sai_sub.o
-obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai-sub.o
+obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai-sub.o
 
 snd-soc-stm32-sai-objs := stm32_sai.o
-obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai.o
+obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai.o
 
 # I2S
 snd-soc-stm32-i2s-objs := stm32_i2s.o
-obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-i2s.o
+obj-$(CONFIG_SND_SOC_STM32_I2S) += snd-soc-stm32-i2s.o