Remove unused PROC_CHANGE_PENALTY constant

Remove unused PROC_CHANGE_PENALTY constant

This constant hasn't been used since before the git era (2.6.12) and thus
can be dropped.

Signed-off-by: Stephen Boyd <[email protected]>
Cc: Russell King <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Hirokazu Takata <[email protected]>
Cc: Kyle McMartin <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Matt Turner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>