radv: Update LoaderICDInterfaceVersion to v5

With the proper version checking in the common vulkan instance code
(commit 88b9b68f

) it is now possible to bring the reported interface
version up to v5.
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <!14563>

src/amd/vulkan/radv_device.c

@@ -6197,8 +6197,14 @@ vk_icdNegotiateLoaderICDInterfaceVersion(uint32_t *pSupportedVersion)
     *
     *    - Loader interface v4 differs from v3 in:
     *        - The ICD must implement vk_icdGetPhysicalDeviceProcAddr().
+    * 
+    *    - Loader interface v5 differs from v4 in:
+    *        - The ICD must support Vulkan API version 1.1 and must not return 
+    *          VK_ERROR_INCOMPATIBLE_DRIVER from vkCreateInstance() unless a
+    *          Vulkan Loader with interface v4 or smaller is being used and the
+    *          application provides an API version that is greater than 1.0.
     */
-   *pSupportedVersion = MIN2(*pSupportedVersion, 4u);
+   *pSupportedVersion = MIN2(*pSupportedVersion, 5u);
    return VK_SUCCESS;
 }