x86: zboot: Add a 'go' subcommand

Split out the code that actually boots linux into a separate sub-command.
Add base_ptr to the state to support this.

Show an error if the boot fails, since this should not happen.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
1 file changed