formatutils: Add 8 unused bits to 24 bit depth formats. Add 8 unused bits to unsized GL_DEPTH_COMPONENT and sized GL_DEPTH_COMPONENT24. This results in the corresponding gl::InternalFormat exposing 4 bytes per pixel and fixes a crash when serializing frame buffer depth attachements in FrameCapture for GLES1 on Vulkan. This patch fixes all comparisions crashing in the capture/replay GLES1 tests on SwiftShader. Bug: angleproject:5799 Change-Id: I39c4309d5c7a1740dfd21c53f116b7e175b64847 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2794381 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>