board: siemens: iot2050: Use sysinfo for board initialization

Drop the info structure parsing of the board in favor of our new sysinfo
driver to avoid code duplication.

Signed-off-by: Baocheng Su <baocheng.su@siemens.com>
Signed-off-by: Li Hua Qian <huaqian.li@siemens.com>
[Jan: rebasing, split-up, cleanup]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
2 files changed