hw/misc/exynos4210_pmu: Reorder local variables for readability

hw/misc/exynos4210_pmu: Reorder local variables for readability

Short declaration of 'i' was in the middle of declarations with
assignments.  Make it a little bit more readable.  Additionally switch
from "unsigned" to "unsigned int" as this pattern is more widely used.
No functional change.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Message-id: 20170313184750[email protected]
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>