Fix the SPDX identifier comment as per the licensing rules [1].

[1] https://www.kernel.org/doc/html/latest/process/license-rules.html

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260105113544.574323-7-ankit.k.nautiyal@intel.com

Move the definitions of struct intel_dsb_buffer to the driver specific
files, hiding the implementation details from the shared DSB code.

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/08a8a7745042afcffa647f82ae23ebbeda0234c9.1764155417.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Prepare for hiding the struct intel_dsb_buffer implementation details
from the generic DSB code.

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/af94dc06c55a866efa9105ae0a8d244e4c6b17ab.1764155417.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

The DSB buffer implementation is really independent of display. Pass
struct drm_device instead of struct intel_crtc to
intel_dsb_buffer_create(), and drop the intel_display_types.h include.

Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/a8cee08e8c36c2cf84cb9cda1b9f318db76710af.1764155417.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Refactor DSB implementation to be compatible with Xe driver.

v1: RFC version.
v2: Make intel_dsb structure opaque from external usage. [Jani]
v3: Rebased on latest.
v4:
- Add boundary check in dsb_buffer_memset(). [Luca]
- Use size_t instead of u32. [Luca]
v5: WARN_ON() added for out of boudary case with some optimization. [Luca]
v6: Rebased on latest and fix a rebase-miss.

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231110032518.3564279-1-animesh.manna@intel.com