Fixed some shader warnings.

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

             // DYNAMICLIGHTMAP_ON is used when we have an "enlighten lightmap" ie a lightmap updated at runtime by enlighten.This lightmap contain indirect lighting from realtime lights and realtime emissive material.Offline baked lighting(from baked material / light, 
             // both direct and indirect lighting) will hand up in the "regular" lightmap->LIGHTMAP_ON.
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_LIGHT_TRANSPORT
             #include "../../Material/Material.hlsl"
             #include "../Lit/LitData.hlsl"
 
             HLSLPROGRAM
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_VELOCITY
             #include "../../Material/Material.hlsl"         
             #include "../Lit/LitData.hlsl"
 
             HLSLPROGRAM
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_DEPTH_ONLY
             #include "../../Material/Material.hlsl"
             #include "../Lit/LitData.hlsl"
             ZWrite On 
 
             HLSLPROGRAM
-
-            #pragma vertex Vert
-            #pragma fragment Frag
 
             #define SHADERPASS SHADERPASS_DEPTH_ONLY
             #include "../../Material/Material.hlsl"
             Cull [_CullMode]
 
             HLSLPROGRAM
-
-            #pragma vertex Vert
-            #pragma fragment Frag
 
             #define SHADERPASS SHADERPASS_DISTORTION
             #include "../../Material/Material.hlsl"         

Assets/ScriptableRenderLoop/HDRenderPipeline/Material/Lit/Lit.shader

             // DYNAMICLIGHTMAP_ON is used when we have an "enlighten lightmap" ie a lightmap updated at runtime by enlighten.This lightmap contain indirect lighting from realtime lights and realtime emissive material.Offline baked lighting(from baked material / light, 
             // both direct and indirect lighting) will hand up in the "regular" lightmap->LIGHTMAP_ON.
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_LIGHT_TRANSPORT
             #include "../../Material/Material.hlsl"
             #include "LitData.hlsl"
 
             HLSLPROGRAM
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_DEPTH_ONLY
             #include "../../Material/Material.hlsl"            
             #include "LitData.hlsl"
  
             HLSLPROGRAM
 
-            #pragma vertex Vert
-            #pragma fragment Frag
-
             #define SHADERPASS SHADERPASS_DEPTH_ONLY
             #include "../../Material/Material.hlsl"            
             #include "LitData.hlsl"
             ZWrite Off // TODO: Test Z equal here.
 
             HLSLPROGRAM
-
-            #pragma vertex Vert
-            #pragma fragment Frag
 
             #define SHADERPASS SHADERPASS_VELOCITY
             #include "../../Material/Material.hlsl"         
             Cull [_CullMode]
 
             HLSLPROGRAM
-
-            #pragma vertex Vert
-            #pragma fragment Frag
 
             #define SHADERPASS SHADERPASS_DISTORTION
             #include "../../Material/Material.hlsl"