ARM: restart: only perform setup for restart when soft-restarting

We only need to set the system up for a soft-restart if we're going to
be doing a soft-restart.  Provide a new function (soft_restart()) which
does the setup and final call for this, and make platforms use it.
Eliminate the call to setup_restart() from the default handler.

This means that platforms arch_reset() function is no longer called with
the page tables prepared for a soft-restart, and caches will still be
enabled.

Acked-by: Nicolas Pitre <[email protected]>
Acked-by: Will Deacon <[email protected]>
Acked-by: H Hartley Sweeten <[email protected]>
Acked-by: Kukjin Kim <[email protected]>
Acked-by: Sascha Hauer <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Acked-by: Krzysztof Ha■asa <[email protected]>
Acked-by: Paul Mundt <[email protected]>
Acked-by: Richard Purdie <[email protected]>
Acked-by: Wan ZongShun <[email protected]>
Acked-by: Eric Miao <[email protected]>
Signed-off-by: Russell King <[email protected]>

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