Create include/linux/init.h with stub definitions for kernel
initialization macros. U-Boot has its own initialization mechanism.
Includes:
- Section markers: __init, __exit, __initdata, __devinit, etc.
- Initcall levels: core_initcall(), late_initcall(), etc.
Update compat.h to include init.h and remove duplicate definitions.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
9f80c4e055