Cuttlefish with SwANGLE failed to pass the android.graphics.cts.
BitmapTest#testDrawingHardwareBitmapNotLeaking test, due to a timeout in
dequeueBuffer (error = -110) during an EGL_BUFFER_AGE_EXT surface query.

This change conservatively works around the issue by leaving
EGL_EXT_buffer_age support disabled for SwiftShader.

Further investigation is required to check whether this timeout can also
occur with other Vulkan drivers, and if it can be addressed robustly.

Bug: b/182521420
Bug: angleproject:3529
Change-Id: I54e3767e74bf922f273d8860f9f4cfc8b6589536
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2774030
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@google.com>