[PLAT-8404][UUM-72560][UUM-72565] Change default URP depth format to D24_S8 on embedded platforms

Changes the default depth format on the embedded platforms to D24_S8. D32_S8 causes issues on some devices and setting it as a default to D24_S8 is a more robust and sane default for our platforms.
This also fixes rendering only a black screen on the NXP i.mx8 device on EmbeddedLinux and QNX with a URP test project.

Author: aceunity

Packages/com.unity.render-pipelines.universal/Runtime/2D/Renderer2D.cs

@@ -6,7 +6,7 @@ namespace UnityEngine.Rendering.Universal
 {
     internal sealed partial class Renderer2D : ScriptableRenderer
     {
-        #if UNITY_SWITCH
+        #if UNITY_SWITCH || UNITY_EMBEDDED_LINUX || UNITY_QNX
         const GraphicsFormat k_DepthStencilFormat = GraphicsFormat.D24_UNorm_S8_UInt;
         internal const int k_DepthBufferBits = 24;
         #else

Packages/com.unity.render-pipelines.universal/Runtime/UniversalRenderer.cs

@@ -39,7 +39,7 @@ public enum DepthPrimingMode
     /// </summary>
     public sealed partial class UniversalRenderer : ScriptableRenderer
     {
-        #if UNITY_SWITCH || UNITY_ANDROID
+        #if UNITY_SWITCH || UNITY_ANDROID || UNITY_EMBEDDED_LINUX || UNITY_QNX
         const GraphicsFormat k_DepthStencilFormat = GraphicsFormat.D24_UNorm_S8_UInt;
         const int k_DepthBufferBits = 24;
         #else