[U-Boot] [PATCH v4 1/6] display_options: Refactor to allow obtaining the banner

[sjg at google.com]

Move the display options code into a separate function so that the U-Boot
banner can be obtained from other code. Adjust the 'version' command to
use it.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Tested-by: Bin Meng <bmeng.cn at gmail.com>
---

Changes in v4:
- Fix /** nit in header file

Changes in v3: None
Changes in v2:
- Update the code to be more testable
- Avoid a warning on spring, etc.

 cmd/version.c             |  4 +++-
 include/display_options.h | 19 +++++++++++++++++++
 lib/display_options.c     | 36 +++++++++++++++++++++++++++++++-----
 3 files changed, 53 insertions(+), 6 deletions(-)

Applied to u-boot-dm, thanks!