ACPI: OSL: Export the symbol of acpi_hotplug_schedule

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I67QNJ


CVE: NA

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This patch export the symbol of acpi_hotplug_schedule, and
move the declaration of the acpi_hotplug_schedule in
drivers/acpi/internal.h to include/linux/acpi.h. Drivers
can use this function to online/offline the memory devices.

Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>