bmpblk: Update bitmaps for log screens

In the new design, the navigation bar of the log screens shows keycaps
drawn by depthcharge, the same way as the footer:

  [up] Page up    [down] Page down    [Enter] Back

The keycaps contain the arrow icons and the "Enter" string, or the
volume and power icons on detachables. Therefore, remove the nav-key_*
and nav-button_* sprites, which have the keycap borders built in, and
the nav_icon style.

The fastboot connection status is now drawn on the right of the
navigation bar. Remove max_width from the one_line_desc style, so that
the bitmaps are not padded to the full content width, and set its height
to 21, the same text size as the navigation bar labels.

BUG=b:551743258
BRANCH=none
TEST=BOARD={geralt,rauru,staryu} make
TEST=DETACHABLE=1 BOARD=geralt make
TAG=agy
CONV=4d411a1c-369f-4fd3-ac8a-7bd726afa3b5

Cq-Depend: chromium:8500035
Change-Id: I74d27845a9609c93f804d18933c93c355ba3c1de
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bmpblk/+/8499998
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: 8d9aa0890b3518f310ebe72b1e69f93465435bdb