Remove old isSRGBReadable/Writable queries

These are no longer used.

Change-Id: I0fde85e2b200663eac2bb32c34f90e78d76ad287
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30469
Tested-by: Chris Forbes <chrisforbes@google.com>
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
diff --git a/src/Vulkan/VkFormat.cpp b/src/Vulkan/VkFormat.cpp
index e22844a..b6c72d3 100644
--- a/src/Vulkan/VkFormat.cpp
+++ b/src/Vulkan/VkFormat.cpp
@@ -142,39 +142,6 @@
 	}
 }
 
-bool Format::isSRGBreadable() const
-{
-	switch(format)
-	{
-	case VK_FORMAT_B8G8R8A8_UNORM:
-	case VK_FORMAT_B8G8R8A8_SRGB:
-	case VK_FORMAT_R8G8B8A8_UNORM:
-	case VK_FORMAT_R8G8B8A8_SRGB:
-	case VK_FORMAT_R5G6B5_UNORM_PACK16:
-	case VK_FORMAT_A1R5G5B5_UNORM_PACK16:
-		return true;
-	default:
-		return false;
-	}
-}
-
-bool Format::isSRGBwritable() const
-{
-	switch(format)
-	{
-	case VK_FORMAT_UNDEFINED:
-	case VK_FORMAT_B8G8R8A8_UNORM:
-	case VK_FORMAT_B8G8R8A8_SRGB:
-	case VK_FORMAT_R8G8B8A8_UNORM:
-	case VK_FORMAT_R8G8B8A8_SRGB:
-	case VK_FORMAT_A8B8G8R8_SRGB_PACK32:
-	case VK_FORMAT_R5G6B5_UNORM_PACK16:
-		return true;
-	default:
-		return false;
-	}
-}
-
 bool Format::isFloatFormat() const
 {
 	switch(format)