ASoC: omap-pcm: Include omap-pcm.h

omap_pcm_platform_register() is declared in omap-pcm.h and defined in
omap-pcm.c. To make sure that the function signature matches for both omap-pcm.c
should include omap-pcm.h

Fixes the following warning from sparse:
	sound/soc/omap/omap-pcm.c:235:5: warning: symbol
	'omap_pcm_platform_register' was not declared. Should it be static?
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>

sound/soc/omap/omap-pcm.c

@@ -31,6 +31,7 @@
 #include <sound/pcm_params.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/soc.h>
+#include <sound/omap-pcm.h>
 
 #ifdef CONFIG_ARCH_OMAP1
 #define pcm_omap1510()	cpu_is_omap1510()