Migrate "rounded_corner_content_padding" for bramble

This CL updates resource overlay of

  rounded_corner_content_padding

for bramble so that the same device-specific value can be seen from
both the Framework code and the SysUI.

With my previous CL [1], the SysUI continues to see the same value
even after this migration.

 [1]: I0c3717c0bdfc928167c6eba06247b37caabf33b9
      24d6b891f572f7be419d3acc9793ca68d062cf35

Bug: 215554582
Test: presubmit
Change-Id: I43782197a7f45e907c544fcdf20d32c87c8d79ec