[BC6H] Naming fixes

ScriptableRenderPipeline/Core/Resources/BC6H.compute

-#include "../ShaderLibrary/BC6H.hlsl"
+#include "../ShaderLibrary/Common.hlsl"
+#include "../ShaderLibrary/BC6H.hlsl"
 #include "../ShaderLibrary/Sampling.hlsl"
 
 TextureCube<float4> _Source;

ScriptableRenderPipeline/Core/ShaderLibrary/Fibonacci.hlsl

 #ifndef UNITY_FIBONACCI_INCLUDED
 #define UNITY_FIBONACCI_INCLUDED
 
-#include "Common.hlsl"
-
 // Computes a point using the Fibonacci sequence of length N.
 // Input: Fib[N - 1], Fib[N - 2], and the index 'i' of the point.
 // Ref: Efficient Quadrature Rules for Illumination Integrals

ScriptableRenderPipeline/Core/ShaderLibrary/Sampling.hlsl

 }
 
 // Convert a texel position into normalized position [-1..1]x[-1..1]
-float2 CubemapTexelToNVC(uint2 unPositionTS, uint cubemapSize)
+float2 CubemapTexelToNVC(uint2 unPositionTXS, uint cubemapSize)
-    return 2.0 * float2(unPositionTS) / float(max(cubemapSize - 1, 1)) - 1.0;
+    return 2.0 * float2(unPositionTXS) / float(max(cubemapSize - 1, 1)) - 1.0;
 }
 
 // Map cubemap face to world vector basis
 };
 
 // Convert a normalized cubemap face position into a direction
-float3 CubemapTexelToDirection(float2 positionTS, uint faceId)
+float3 CubemapTexelToDirection(float2 positionNVC, uint faceId)
-    float3 dir = CUBEMAP_FACE_BASIS_MAPPING[faceId][0] * positionTS.x
-               + CUBEMAP_FACE_BASIS_MAPPING[faceId][1] * positionTS.y
+    float3 dir = CUBEMAP_FACE_BASIS_MAPPING[faceId][0] * positionNVC.x
+               + CUBEMAP_FACE_BASIS_MAPPING[faceId][1] * positionNVC.y
                + CUBEMAP_FACE_BASIS_MAPPING[faceId][2];
 
     return normalize(dir);