power: supply: cw2015: Make some symbols static

Fix the following warning:

drivers/power/supply/cw2015_battery.c:96:5: warning:
'cw_update_profile' was not declared. Should it be static?
drivers/power/supply/cw2015_battery.c:712:1: warning:
'cw_bat_pm_ops' was not declared. Should it be static?
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: ChenTao <chentao107@huawei.com>
Acked-by: Tobias Schramm <t.schramm@manjaro.org>
Tested-by: Tobias Schramm <t.schramm@manjaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/cw2015_battery.c

@@ -93,7 +93,7 @@ static int cw_read_word(struct cw_battery *cw_bat, u8 reg, u16 *val)
 	return 0;
 }
 
-int cw_update_profile(struct cw_battery *cw_bat)
+static int cw_update_profile(struct cw_battery *cw_bat)
 {
 	int ret;
 	unsigned int reg_val;
@@ -709,7 +709,7 @@ static int __maybe_unused cw_bat_resume(struct device *dev)
 	return 0;
 }
 
-SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);
+static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);
 
 static int cw_bat_remove(struct i2c_client *client)
 {