arm: Use generic idle loop

arm: Use generic idle loop

Use the generic idle loop and replace enable/disable_hlt with the
respective core functions.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Paul McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Reviewed-by: Cc: Srivatsa S. Bhat <[email protected]>
Cc: Magnus Damm <[email protected]>
Cc: Russell King <[email protected]>
Tested-by: Kevin Hilman <[email protected]> # OMAP
Link: http://lkml.kernel.org/r/[email protected]