Remove useless const on ImageView::getImageSizeInBytes return value

This does nothing, and breaks the Android build since the toolchain
there uses -Wignored-qualifiers. This is the only case of it in
SwiftShader.

Change-Id: Ida06e695bd3f303200864a4fd2a797cb4c78dc15
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29888
Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>

src/Vulkan/VkImageView.hpp

diff --git a/src/Vulkan/VkImageView.hpp b/src/Vulkan/VkImageView.hpp
index e4c4d81..048af64 100644
--- a/src/Vulkan/VkImageView.hpp
+++ b/src/Vulkan/VkImageView.hpp
@@ -50,7 +50,7 @@
 
 	const VkComponentMapping &getComponentMapping() const { return components; }
 	const VkImageSubresourceRange &getSubresourceRange() const { return subresourceRange; }
-	const size_t getImageSizeInBytes() const { return image->getMemoryRequirements().size; }
+	size_t getImageSizeInBytes() const { return image->getMemoryRequirements().size; }
 
 private:
 	bool                          imageTypesMatch(VkImageType imageType) const;