regulator: tps65218: Add terminate entry for of_device_id table

Fixes below build error:
FATAL: drivers/regulator/tps65218-regulator: struct of_device_id is not terminated with a NULL entry!
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Acked-by: NKeerthy <j-keerthy@ti.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

drivers/regulator/tps65218-regulator.c

@@ -96,6 +96,7 @@ static const struct of_device_id tps65218_of_match[] = {
 	TPS65218_OF_MATCH("ti,tps65218-dcdc5", tps65218_pmic_regs[DCDC5]),
 	TPS65218_OF_MATCH("ti,tps65218-dcdc6", tps65218_pmic_regs[DCDC6]),
 	TPS65218_OF_MATCH("ti,tps65218-ldo1", tps65218_pmic_regs[LDO1]),
+	{ }
 };
 MODULE_DEVICE_TABLE(of, tps65218_of_match);