lsm: check payload size validity in lsm_event_detect_status_v3

Payload size validity is not checked before using it in array index.
Check payload size to avoid out-of-boundary memory. Add the check
in lsm_event_detect_status_v3.

Change-Id: I2f4ec3af5fa60ada6155ff3cf88e122a9066ab3b
Signed-off-by: Kunlei Zhang <kunleiz@codeaurora.org>