drm/msm: generate headers on the fly

Generate DRM/MSM headers on the fly during kernel build. This removes a
need to push register changes to Mesa with the following manual
synchronization step. Existing headers will be removed in the following
commits (split away to ease reviews).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/585862/
Link: https://lore.kernel.org/r/20240401-fd-xml-shipped-v5-11-4bdb277a85a1@linaro.org