vkGetRenderAreaGranularity implementation

There's no reason to have any limitation on granularity in
SwiftShader, so the granularity is always 1 pixel.

Passes all tests in:
dEQP-VK.api.granularity

Bug b/119620965

Change-Id: Ie2f09737c0054da1b6806b9572e515446a8b1263
Reviewed-on: https://swiftshader-review.googlesource.com/c/24890
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Vulkan/VkRenderPass.hpp

diff --git a/src/Vulkan/VkRenderPass.hpp b/src/Vulkan/VkRenderPass.hpp
index 2355bb6..8a8a63d 100644
--- a/src/Vulkan/VkRenderPass.hpp
+++ b/src/Vulkan/VkRenderPass.hpp
@@ -29,6 +29,8 @@
 
 	static size_t ComputeRequiredAllocationSize(const VkRenderPassCreateInfo* pCreateInfo);
 
+	void getRenderAreaGranularity(VkExtent2D* pGranularity) const;

+
 	void begin();
 	void nextSubpass();
 	void end();