ASoC: sh: depend on COMMON_CLK to fix compile tests

The SH4 FSI sound drivers use SuperH clocks thus they cannot be built on
platforms without proper clock support (e.g. compile test on MIPS with
RALINK and SOC_RT305X):

    /usr/bin/mips-linux-gnu-ld: sound/soc/sh/fsi.o: in function `fsi_clk_set_rate_external':
    fsi.c:(.text+0x2714): 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/20201116175133.402553-2-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/Kconfig

@@ -23,6 +23,7 @@ config SND_SOC_SH4_SSI
 
 config SND_SOC_SH4_FSI
 	tristate "SH4 FSI support"
+	depends on SUPERH || COMMON_CLK
 	select SND_SIMPLE_CARD
 	help
 	  This option enables FSI sound support