ASoC: wcd934x: Add missing COMMON_CLK dependency

Looks like some platforms are not yet using COMMON CLK.

PowerPC allyesconfig failed with below error in next

ld: sound/soc/codecs/wcd934x.o:(.toc+0x0):
	 undefined reference to `of_clk_src_simple_get'
ld: sound/soc/codecs/wcd934x.o: in function `.wcd934x_codec_probe':
wcd934x.c:(.text.wcd934x_codec_probe+0x3d4):
	 undefined reference to `.__clk_get_name'
ld: wcd934x.c:(.text.wcd934x_codec_probe+0x438):
	 undefined reference to `.clk_hw_register'
ld: wcd934x.c:(.text.wcd934x_codec_probe+0x474):
	 undefined reference to `.of_clk_add_provider'

Add the missing COMMON_CLK dependency to fix this errors.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200204111241.6927-1-srinivas.kandagatla@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -1334,6 +1334,7 @@ config SND_SOC_WCD9335
 
 config SND_SOC_WCD934X
 	tristate "WCD9340/WCD9341 Codec"
+	depends on COMMON_CLK
 	depends on MFD_WCD934X
 	help
 	  The WCD9340/9341 is a audio codec IC Integrated in