Driver installation instruction

2019-6-6 update

New feature and improvement

• Update SDK headers to 1.1.109
• Enable Scratch Bounds Checking for GFX9
• VK_MEMORY_OVERALLOCATION_BEHAVIOR_ALLOWED_AMD: add support for the attachment image Vulkan memory type
• Optimizations for acquire-release barrier

Issue fix

• F1 2018 hang on gfx9
• Some acquire-release barrier issues
• World War Z - black patches corruption