msm: camera: Fix out of bound read access

Input num_streams cannot be greater than the max allowed
number of streams, otherwise this casue OOB read access.

Add bounds check for num_streams which from user input.

CRs-Fixed: 2330040
Change-Id: I76fb785dc54c597603d748d604844952cea659ea
Signed-off-by: Haibin Liu <haibinl@codeaurora.org>