msm: vidc: Protect debug_buffer access in core_info_read with lock.

Serialize core_info_read with lock so that multiple concurrent
threads do not cause the write to overflow. Also have the bound
check to avoid overflow in write_str function.

CRs-Fixed: 2013361
Change-Id: Ia18a4b94cafd69af1d367861f2499fc202f18e9f
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>