Update animation on storage item

To prevent the flicker happening, the animation is being applied to both
progress bar and storage size info in the storage item.

Bug: 222421324
Test: manual test
1) Install memory fill
2) Increase storage size using memory fill
3) Navigate to Settings > Storage
3) Check the progress bar and size info has animation when updating

Change-Id: I4583358697afd416bc20cafac3ff89361397b6b9