Update style resources for progress-spinner

This change is split out from ag/22635078 so that the functionality and
the material resources can be done separately. The relevant parts of the
commit message from there are copied below for reference.

- This change modifies the system progress spinner
(indeterminate/horizontal) for use on w3.

spec: https://docs.google.com/presentation/d/1YqqNzmgW6C6-zZJdhE3zTvxPe24BBn66FLYalpSgww0/edit#slide=id.gdea00a2fd1_0_169
video: https://drive.google.com/file/d/1hZzk-UBx7DOx5W7282_nB-5nDb5ppDxb/view?usp=sharing&resourcekey=0-eD2vvlCeyYhdF5sG2AwSmQ

Note that UI makes use of system color attributes:
- colorControlNormal (spinner)
- colorProgressBackgroundNormal (track)

Bug: 194441833
Bug: 192470870
Bug: 192470222

Test: manual check
      - Settings > System > Disconnect & Reset
      - Power > Shutdown
      - Power > Restart

Change-Id: I489dce4a54505738654610b6c7c1666ecbc415fc

Upstreaming Bug: 272532971

Also includes these changes:

--------------------------------------------------------------------

[UX] Update ShutdownThread UI as per UX Spec

Updates include:
* addition of round-watch-specific layout for progressbar screen
* progress bar colors changed from blue to material white and grey
* progress bar text to smaller size
* removed ellipses from string text

Bug: b/257537152
Video: https://broadcast.corp.google.com/ui/player/75926391-22bd-4127-9f38-73dba5fdc0f6
Test: flashed locally and ran fake-ota script
Upstreaming Bug: b/272534061

--------------------------------------------------------------------

Change-Id: I7b0a967606398d1cb91508888649ac03a69b29c8