ASoC: core: protect component list traversal with lock

Protect soc component list traversal using mutex lock
to prevent it being modified (add/delete nodes) by other
thread at the same time.

CRs-fixed: 981674
Change-Id: I0bc003f9ca1d490b65d5a4121562ed68f026f9bf
Signed-off-by: Phani Kumar Uppalapati <phaniu@codeaurora.org>