ASoC: msm: metaInfo support in acdb kernel driver

implements store_meta_info and get_meta_info API
metainfo is supplied by userspace to kernel driver via
store_meta_info, later this info is sent to ADSP by querying
using get_meta_info

Change-Id: Ic1202b906422baecf7d42738eca827b7f6046da2
Signed-off-by: Srikanth Uyyala <suyyala@codeaurora.org>