Vulkan: Add 565 configs for Android

Generate GL_RGB565 internal format configs for Android VK. This allows
apps requesting such formats to map to the appropriate corresponding
Android internal pixel format.

Bug: angleproject:2863
Change-Id: I18f119d6554a601037a40db27234bf33e0ada438
Reviewed-on: https://chromium-review.googlesource.com/c/1258083
Commit-Queue: Tobin Ehlis <tobine@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/vulkan/android/DisplayVkAndroid.cpp

@@ -47,7 +47,7 @@ SurfaceImpl *DisplayVkAndroid::createWindowSurfaceVk(const egl::SurfaceState &st
 
 egl::ConfigSet DisplayVkAndroid::generateConfigs()
 {
-    constexpr GLenum kColorFormats[] = {GL_RGBA8, GL_RGB8};
+    constexpr GLenum kColorFormats[] = {GL_RGBA8, GL_RGB8, GL_RGB565};
     constexpr EGLint kSampleCounts[] = {0};
     return egl_vk::GenerateConfigs(kColorFormats, egl_vk::kConfigDepthStencilFormats, kSampleCounts,
                                    this);