Revert "Move FastBitmapDrawableTest to Robolectric"

Revert submission 26605558-robolectric-enable-androidx-rules

Reason for revert: Droid-monitor created revert due to build breakages in b/330752689.

Reverted changes: /q/submissionid:26605558-robolectric-enable-androidx-rules

Change-Id: I7cb746baffc9bec3315dd324173fd9bde100e4cf
diff --git a/tests/multivalentTests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java b/tests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java
similarity index 100%
rename from tests/multivalentTests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java
rename to tests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java