The ux500 machine was actually defining platform data for the
staging driver ste_rmi4, which is not OK. Let us instead define
some __weak platform data in the machine so that the staging
driver can override it at compile-time and we can thus have the
driver self-contained in staging.

Reported-by: Axel Lin
Signed-off-by: Linus Walleij
Signed-off-by: Greg Kroah-Hartman