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