Change Vulkan API to 1.2

The commit changes the platform code to support Vulkan 1.2.

Bug: 191881132
Test: build
Change-Id: I6e71a84b85874a71031734004b8e44ee0ea7446f
diff --git a/vulkan/libvulkan/api.cpp b/vulkan/libvulkan/api.cpp
index fa3b260..9ecc568 100644
--- a/vulkan/libvulkan/api.cpp
+++ b/vulkan/libvulkan/api.cpp
@@ -1473,7 +1473,7 @@
     if (!EnsureInitialized())
         return VK_ERROR_OUT_OF_HOST_MEMORY;
 
-    *pApiVersion = VK_API_VERSION_1_1;
+    *pApiVersion = VK_API_VERSION_1_2;
     return VK_SUCCESS;
 }