ASoC: core: Fix possible NULL pointer de-reference

Fix the soc_find_component function to make sure either of_node or
name is provided to compare against the registered components to fix
possible NULL pointer de-reference.

CRs-fixed: 925138
Change-Id: Ic1f02c341c06cadcfe6de638ff6c86e51845e59f
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>
Signed-off-by: Meng Wang <mwang@codeaurora.org>