ASoC: jz4740: Remove Makefile entry for removed file

Commit 0406a40a ("ASoC: jz4740: Use the generic dmaengine PCM driver")
jz4740-pcm.c file, but neglected to remove the Makefile entries.

Fixes: 0406a40a ("ASoC: jz4740: Use the generic dmaengine PCM driver")
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Reported-by: NRalf Baechle <ralf@linux-mips.org>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/jz4740/Makefile

 #
 # Jz4740 Platform Support
 #
-snd-soc-jz4740-objs := jz4740-pcm.o
 snd-soc-jz4740-i2s-objs := jz4740-i2s.o
 
-obj-$(CONFIG_SND_JZ4740_SOC) += snd-soc-jz4740.o
 obj-$(CONFIG_SND_JZ4740_SOC_I2S) += snd-soc-jz4740-i2s.o
 
 # Jz4740 Machine Support