dt-bindings: display: msm: Document the Glymur Display Processing Unit

dt-bindings: display: msm: Document the Glymur Display Processing Unit

Add DPU for Qualcomm Glymur SoC which has very few changes compared
to SM8750, just enough to make them incompatible.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/683716/
Link: https://lore.kernel.org/r/20251027-glymur-display-v3-2-aa13055818ac@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>