msm: camera: sync: Prevent OOB access of sync name

Issue:
strlcpy calls strlen on src ptr. If src is not NULL terminated then OOB
access will occur in below stack.
  strlen
  strlcpy
  cam_sync_init_row
  cam_sync_handle_create
  cam_sync_dev_ioctl

Fix:
Pad user-space supplied name with NULL.

CRs-Fixed: 3010262
Change-Id: Ib5c2fbfe395025ec05e0bb2980f86111e95ff54c
Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>