layers: Add framebuffer attachmentCount check
layers: Add framebuffer attachmentCount check

Verify that attachmentCount for a framebuffer matches the
attachmentCount for the renderPass that framebuffer is being
created with.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools