Fix convertLowpAndMediumpFloatUniformsTo16Bits condition

The convertLowpAndMediumpFloatUniformsTo16Bits feature relies on the
following vulkan features to be enabled when creating the VkDevice
through vkCreateDevice():
VkPhysicalDevice16BitStorageFeatures.uniformAndStorageBuffer16BitAccess,
VkPhysicalDeviceShaderFloat16Int8Features.shaderFloat16

Previously we are checking if these vulkan features are supported, this
CL changed the condition  to check if these vulkan features will
actually be enabled on the VkDevice created.

Bug: angleproject:405795981
Change-Id: I6c46d5982b7e793f5d0326cf6c1cb5afa3a9d0a0
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/7164378
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>

Author: HuYuxin

src/libANGLE/renderer/vulkan/vk_renderer.cpp

@@ -6584,9 +6584,8 @@ void Renderer::initFeatures(const vk::ExtensionNameList &deviceExtensionNames,
     // Disable on driver implementations other than ARM proprietary until the performance impact on
     // them is verified.
     ANGLE_FEATURE_CONDITION(&mFeatures, convertLowpAndMediumpFloatUniformsTo16Bits,
-                            m16BitStorageFeatures.uniformAndStorageBuffer16BitAccess == VK_TRUE &&
-                                mShaderFloat16Int8Features.shaderFloat16 == VK_TRUE &&
-                                isARMProprietary);
+                            mFeatures.supports16BitUniformAndStorageBuffer.enabled &&
+                                mFeatures.supportsShaderFloat16.enabled && isARMProprietary);
 
     ANGLE_FEATURE_CONDITION(&mFeatures, supportsUnifiedImageLayouts,
                             mUnifiedImageLayoutsFeatures.unifiedImageLayouts == VK_TRUE);