init.h: Add early_param_on_off()

At times all you need is a kconfig variable to enable a feature,
by default but you may want to also enable / disable it through
a kernel parameter. In such cases the parameter routines to turn
the thing on / off are really simple. Just use a wrapper for
this, it lets us generalize the code and makes it easier to
associate parameters with related kernel configuration options.

Signed-off-by: Luis R. Rodriguez <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David Vrabel <[email protected]>
Cc: Dexuan Cui <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: [email protected]
Cc: Jan Beulich <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Lindgren <[email protected]>
Cc: Toshi Kani <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Xishi Qiu <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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