layers: Move CreateImage validation into core_val

Was in Image layer.  Added layer_data accessor functions.

Change-Id: I55b7896cfc9de81210c9fba4d332998c827f5d44
diff --git a/layers/buffer_validation.h b/layers/buffer_validation.h
index a5fd396..88342a1 100644
--- a/layers/buffer_validation.h
+++ b/layers/buffer_validation.h
@@ -21,11 +21,16 @@
 #define CORE_VALIDATION_BUFFER_VALIDATION_H_
 
 #include "core_validation_types.h"
+#include "core_validation_error_enums.h"
 #include "vulkan/vk_layer.h"
 #include <memory>
 #include <unordered_map>
 #include <vector>
 
+
+bool PreCallValidateCreateImage(core_validation::layer_data *device_data, const VkImageCreateInfo *pCreateInfo,
+                                const VkAllocationCallbacks *pAllocator, VkImage *pImage);
+
 void PostCallRecordCreateImage(std::unordered_map<VkImage, std::unique_ptr<IMAGE_STATE>> *imageMap,
                                std::unordered_map<VkImage, std::vector<ImageSubresourcePair>> *imageSubresourceMap,
                                std::unordered_map<ImageSubresourcePair, IMAGE_LAYOUT_NODE> *imageLayoutMap,