When generating the default EGL configs, populate
EGL_NATIVE_VISUAL_ID with AHARDWAREBUFFER formats.

Bug: angleproject:4469
Change-Id: Ifde9df0497cbd4e01219ab6067acd8d97f8460e4
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2101577Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Mohan Maiya <m.maiya@samsung.com>