Build error: undefined reference to `snd_soc_unregister_codec'

[Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>]

When building ALSA as modules:

drivers/built-in.o: In function `omapdss_hdmihw_remove':
omap_hwspinlock.c:(.text+0x23da8): undefined reference to `snd_soc_unregister_codec'
drivers/built-in.o: In function `omapdss_hdmihw_probe':
omap_hwspinlock.c:(.text+0x24248): undefined reference to `snd_soc_register_codec'

(the filename is inaccurate).

This happens because drivers/video/omap2/dss/hdmi.c is built-in and uses
ASoC services, but ASoC and ALSA are modular.
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