ACPI: EC: Rename three functions

Rename acpi_ec_submit_query() to acpi_ec_submit_event(),
acpi_ec_query() to acpi_ec_submit_query(), and
acpi_ec_complete_query() to acpi_ec_close_event() to make
the names reflect what the functions do.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>