bmpblk: Rename button styles to H1/H2/H3

Rename the button styles in format.yaml after the H1, H2, and H3
buttons drawn by depthcharge. No functional change.
- Rename primary_button to h1_button.
- Split secondary_button into h2_button for the "Advanced options"
  dropdown, and h3_button for the "Power off" and "Launch diagnostics"
  buttons.

BUG=b:551743258
BRANCH=none
TEST=LOCALES=en BOARD=asurada make
TAG=agy
CONV=4d411a1c-369f-4fd3-ac8a-7bd726afa3b5

Cq-Depend: chromium:8485905
Change-Id: I0d3d9c6dc71b98254f5c4e0c0e4b40486a6a6964
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bmpblk/+/8482773
Tested-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Chen-Tsung Hsieh <chentsung@chromium.org>
Commit-Queue: Yu-Ping Wu <yupingso@chromium.org>
GitOrigin-RevId: 24f908de95f5f1bfb2d325393cdbf9afd7eaa649