ASoC: msm: hold lock while allocating and freeing ASM clients

ASM client allocation and free have to happen atomically to avoid
ASM APR being in wrong state. So hold lock while allocating and freeing
ASM clients.

CRs-Fixed: 554249
Change-Id: Ie6d2e87445cc06de990c9e8bed6dbf88ac79cd3a
Signed-off-by: Kiran Kandi <kkandi@codeaurora.org>