Change license header for mtk_camera-v4l2-controls.h

The license header for mtk_camera-v4l2-controls.h should include
the Linux-syscall-note for userspace usage.

TEST=emerge libcamera-mtkisp7

Change-Id: Ic092f41407b2c3c63d39ca92ee0e18df3b87deed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libcamera/+/6371375
Reviewed-by: Harvey Yang <chenghaoyang@chromium.org>
Commit-Queue: Hanlin Chen <hanlinchen@google.com>
Auto-Submit: Hanlin Chen <hanlinchen@google.com>
Tested-by: Hanlin Chen <hanlinchen@google.com>