Disable HDR extension for now

Test: adb shell vkinfo
Test: Should not see VK_EXT_hdr_metadata in extension list.

bug: 36007564

Change-Id: I96a365d75ddec75856af2fda834d3a4f8368ebb0
diff --git a/vulkan/libvulkan/driver.cpp b/vulkan/libvulkan/driver.cpp
index 351caeb..b62eec6 100644
--- a/vulkan/libvulkan/driver.cpp
+++ b/vulkan/libvulkan/driver.cpp
@@ -778,9 +778,6 @@
     loader_extensions.push_back({
         VK_GOOGLE_DISPLAY_TIMING_EXTENSION_NAME,
         VK_GOOGLE_DISPLAY_TIMING_SPEC_VERSION});
-    loader_extensions.push_back({
-        VK_EXT_HDR_METADATA_EXTENSION_NAME,
-        VK_EXT_HDR_METADATA_SPEC_VERSION});
 
     // conditionally add shared_presentable_image if supportable
     VkPhysicalDevicePresentationPropertiesANDROID presentation_properties;