omap2_gpio_prepare_for_idle not functioning in suspend

[Russ Dill]

After the gpio-omap runtime PM changes, I noticed that the
omap2_gpio_prepare_for_idle/omap2_gpio_resume_after_idle functions are
a NOP in the case of suspend.

void omap2_gpio_prepare_for_idle(int pwr_mode)
{
        struct gpio_bank *bank;

        list_for_each_entry(bank, &omap_gpio_list, node) {
                if (!bank->mod_usage)
                        continue;

                bank->power_mode = pwr_mode;

                pm_runtime_put_sync_suspend(bank->dev);
        }
}

void omap2_gpio_resume_after_idle(void)
{
        struct gpio_bank *bank;

        list_for_each_entry(bank, &omap_gpio_list, node) {
                if (!bank->mod_usage)
                        continue;

                pm_runtime_get_sync(bank->dev);
        }
}

(called from omap_pm_enter->omap3_pm_suspend->omap_sram_idle)

At the point that platform_suspend_ops.enter is called,
dpm_suspend_end has already been called which disables runtime_pm.
During a suspend/resume where power is lost to certain GPIO banks, the
context will not be restored.
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