ACPICA: Move acpi_gbl_next_cmd_num definition to acglobal.h

ACPICA commit 8296a24f33984c26a61103c590b049de3c9b61ff

This commit cleans up the code by moving the global definition out of
dbhistry.c to acglobal.h.

Link: https://github.com/acpica/acpica/commit/8296a24f


Reported-by: Hulk Robot <hulkci@huawei.com>
Suggested-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Erik Kaneda <erik.kaneda@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>