mfd: max77686: Drop of_match_ptr from of_device_id table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it is not relevant here). This fixes
compile warning (!CONFIG_OF on x86_64):

drivers/mfd/max77686.c:148:34: warning: ‘max77686_pmic_dt_match’ defined but not used [-Wunused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Chanwoo Choi <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/max77686.c

···
 	.driver = {
 		   .name = "max77686",
 		   .pm = &max77686_pm,
-		   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
+		   .of_match_table = max77686_pmic_dt_match,
 	},
 	.probe_new = max77686_i2c_probe,
 };