dibs: Use subsys_initcall()

dibs: Use subsys_initcall()

In the case of built-in modules, the order of module_init() calls are
derived from the Makefiles.

Use subsys_initcall() for the dibs module, to make sure dibs_init() is
executed before dibs clients like smc and dibs devices like ism are
initialized. So future dibs client or dibs device modules can use
module_init() without the risk of getting the order in the Makefiles wrong.

Reported-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20251023150636.3995476-2-wintera@linux.ibm.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>