ASoC: stm: depend on COMMON_CLK to fix compile tests

The STM32 I2S drivers use Common Clock Framework thus they cannot be
built on platforms without it (e.g. compile test on MIPS with RALINK and
SOC_RT305X):

    /usr/bin/mips-linux-gnu-ld: sound/soc/stm/stm32_i2s.o: in function `stm32_i2s_hw_params':
    stm32_i2s.c:(.text+0x1870): undefined reference to `clk_set_parent'
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201116175133.402553-3-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/stm/Kconfig

@@ -15,6 +15,7 @@ config SND_SOC_STM32_SAI
 config SND_SOC_STM32_I2S
 	tristate "STM32 I2S interface (SPI/I2S block) support"
 	depends on (ARCH_STM32 && OF) || COMPILE_TEST
+	depends on COMMON_CLK
 	depends on SND_SOC
 	select SND_SOC_GENERIC_DMAENGINE_PCM
 	select REGMAP_MMIO