add CONFIG_SND_SOC_PCM5102A=m option to linux-armv7 package

[luoyi]

Hi, can we add CONFIG_SND_SOC_PCM5102A=m option to linux-armv7 and linux-armv7-rc package ? it's a very simple sound card. sometimes we may need combined it with the dai driver to get a workable i2s audio system.