Fix Bug#26258

Fix Bug#26258

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
Autoload.  Call `tramp-register-foreign-file-name-handler'.  (Bug#26258)

* lisp/net/tramp.el (tramp-autoload-file-name-handler): Remove.
(tramp-register-autoload-file-name-handlers)
(tramp-register-file-name-handlers): Do not handle
`tramp-autoload-file-name-handler' anymore.  Mark `operations'
the handlers are responsible for.
(tramp-register-foreign-file-name-handler): New defun.