ACPI: EC: Rename acpi_ec_is_gpe_raised()

Rename acpi_ec_is_gpe_raised() into acpi_ec_gpe_status_set(),
update its callers accordingly and drop the ternary operator
(which isn't really necessary in there) from it.

No intentional functional impact.

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