PM: ARM: locomo: Drop suspend and resume bus type callbacks

None of the locomo drivers in the tree implements the suspend and
resume callbacks from struct locomo_driver, so drop them and drop
the corresponding callbacks from locomo_bus_type.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>