Update AccessibilityEmbeddedHierarchyTest to use DP dimens.

Hardcoding these values as px was causing failures on devices with
different screen densities than phone, such as auto.

Bug: 289120804
Test: atest AccessibilityEmbeddedHierarchyTest (on CF auto)
Change-Id: I026bf45d3e6c55de285d0d66da5b926811de957d
3 files changed