NVIDIA: VR: SAUCE: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal

CXL is linked before fwctl in drivers/Makefile. Both use `module_init,
so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls
`fwctl_register()` and then `device_add()`, fwctl_class is not yet
registered because fwctl_init() hasn't run, causing `class_to_subsys()`
to return NULL and skip knode_class initialization.
On device removal, `class_to_subsys()` returns non-NULL, and
`device_del()` calls `klist_del()` on the uninitialized knode,
triggering a NULL pointer dereference [1].

Fixes: 858ce2f ("cxl: Add FWCTL support to CXL")
Reviewed-by: Kai-Heng Feng <kaihengf@nvidia.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Richard Cheng <icheng@nvidia.com>
(backported from https://lore.kernel.org/all/20260409051902.40218-1-icheng@nvidia.com/)
Signed-off-by: Richard Cheng <icheng@nvidia.com>

Author: nvax-r

drivers/fwctl/main.c

@@ -415,7 +415,7 @@ static void __exit fwctl_exit(void)
 	unregister_chrdev_region(fwctl_dev, FWCTL_MAX_DEVICES);
 }
 
-module_init(fwctl_init);
+subsys_initcall(fwctl_init);
 module_exit(fwctl_exit);
 MODULE_DESCRIPTION("fwctl device firmware access framework");
 MODULE_LICENSE("GPL");