Vulkan: correctly expose Vulkan entry points

This change fixes the advertisement of core Vulkan entry points as below:
1. GIPA returns a valid checked_proc for 1.1 core device APIs.
2. GDPA returns NULL for 1.1 core device APIs on a 1.0 physical device.

Bug: 134185757
Bug: 142266108
Test: dEQP-VK.memory.binding on 1.1 loader and 1.0 device ICD
Test: dEQP-VK.api.info.instance on 1.1 loader and 1.0 instance ICD
Change-Id: I0a3e06dc04bade4f36a7e68ee2f53979c656ee4e
diff --git a/vulkan/libvulkan/api.cpp b/vulkan/libvulkan/api.cpp
index 48f26e7..1578d9f 100644
--- a/vulkan/libvulkan/api.cpp
+++ b/vulkan/libvulkan/api.cpp
@@ -519,7 +519,11 @@
       get_device_proc_addr_(nullptr),
       driver_extensions_(nullptr),
       driver_extension_count_(0) {
-    enabled_extensions_.set(driver::ProcHook::EXTENSION_CORE);
+    // advertise the loader supported core Vulkan API version at vulkan::api
+    for (uint32_t i = driver::ProcHook::EXTENSION_CORE_1_0;
+         i != driver::ProcHook::EXTENSION_COUNT; ++i) {
+        enabled_extensions_.set(i);
+    }
 }
 
 LayerChain::~LayerChain() {