[roll] Roll fuchsia [fake-display] Remove FakeDisplayStack from unit tests.

FakeDisplayStack attaches a Display Coordinator to the FakeDisplay
driver implementation. This introduces the following problems.

1. Some tests replace the Coordinator's event listener with their own,
   in order to catch OnCaptureComplete events.  This makes the tests
   difficult to reason about, because the Coordinator does not support
   having its event listener removed, and the driver does not support
   having its event listener replaced.

2. This is an unnecessary increase in the test surface area, because
   FakeDisplay only depends on Sysmem and on the Driver Runtime.

This CL replaces the FakeDisplayStack with the parts that are used in
the unit test.

Original-Bug: 388885807
Test: fx test //src/graphics/display/drivers/fake
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1233747
Original-Revision: 66dbab63930a1d4702d58be39cbb8ab35aa18053
GitOrigin-RevId: a284b69420363638a82ab237f3082fa55e82403b
Change-Id: I81fb8db55513f597362e0f8004039b1c11e4f2ed

Author: Victor Costan

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="4932b666cdd6b21ce8c7924ae55bdcacb5ed6991"/>
+             revision="66dbab63930a1d4702d58be39cbb8ab35aa18053"/>
   </projects>
   <hooks>
     <hook name="install-environment"