asoc: Add check to handle negative value passed for num_app_cfg_type

Long int negative value passed as part of ucontrol structure
is assigned to int num_app_cfg_type making it positive and
leading to overflow while populating maximum supported
lsm_app_type_cfg structures.

Change-Id: I81e3c75eea82265c8e8e1b3f8f95d9e334c895c4
Signed-off-by: Harshal Ahire <hahire@codeaurora.org>