ASoC: msm: Use legacy ASM APIs for older targets

With 3.18 kernel, get_session_time command to
DSP is updated to new command. This
command is not supported on older targets as
they have an older DSP version. To have backwards
compatibility, based on DSP version choose which
command to use.

CRs-Fixed: 978676
Change-Id: I76b0cfcd84df90d7a206690cb8aa1eb773fdc53d
Signed-off-by: Ashish Jain <ashishj@codeaurora.org>