param: convert some "on"/"off" users to strtobool

param: convert some "on"/"off" users to strtobool

This changes several users of manual "on"/"off" parsing to use
strtobool.

Some side-effects:
- these uses will now parse y/n/1/0 meaningfully too
- the early_param uses will now bubble up parse errors

Signed-off-by: Kees Cook <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
Acked-by: Michael Ellerman <[email protected]>
Cc: Amitkumar Karwar <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Nishant Sarmukadam <[email protected]>
Cc: Rasmus Villemoes <[email protected]>
Cc: Steve French <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>