ASoC: soc-component: add snd_soc_component_compr_pointer()

component related function should be implemented at
soc-component.c.
This patch adds snd_soc_component_compr_pointer().

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/874klt7v65.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Mark Brown <broonie@kernel.org>