init: remove CONFIG_INIT_FALLBACK

init: remove CONFIG_INIT_FALLBACK

CONFIG_INIT_FALLBACK adds config bloat without an obvious use case that
makes it worth keeping around.  Delete it.

Signed-off-by: Andy Lutomirski <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Chuck Ebbert <[email protected]>
Cc: Frank Rowand <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Rob Landley <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>