mfd: sec-core: Enable RTC on S2MPS11 PMIC

The S2MPS11 PMIC (present on Arndale Octa board) has the same RTC module
as S2MPS14 device. Add respective mfd cell to enable it.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/sec-core.c

@@ -68,6 +68,8 @@ static const struct mfd_cell s5m8767_devs[] = {
 static const struct mfd_cell s2mps11_devs[] = {
 	{
 		.name = "s2mps11-pmic",
+	}, {
+		.name = "s2mps14-rtc",
 	}, {
 		.name = "s2mps11-clk",
 		.of_compatible = "samsung,s2mps11-clk",