Merge patch series "sysinfo: Expand sysinfo with some more banner information"

To quote the author:

The show_board_info() function was adjusted to weak so that it could be
entirely replaced with a board-specific implementation.

The intended way for boards to provide their own information is via a
sysinfo driver. But currently there is no way to show anything other
than the model name.

This series adds support for showing a few more items, in a way that is
easy for boards to extend.

Since there is already a weak checkboard() function, we don't need to
have two levels of weak function here. So this series drops the weak
attribute from show_board_info()

Existing boards will see a slight change in output, in that the model
name will appear first, before any custom output. If that is a problem,
then the solution is to implement a sysinfo driver for the board.