rtc: rx8111: demote warnings to debug level

The proper way for userspace to react on a read time error is to have a
look at the voltage low information. There is no point in cluttering dmesg
as it is often not even visible to the end user.

Reviewed-by: Waqar Hameed <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-rx8111.c

···
 	}
 
 	if (FIELD_GET(RX8111_FLAG_XST_BIT, regval)) {
-		dev_warn(data->dev,
-			 "Crystal oscillation stopped, time is not reliable\n");
+		dev_dbg(data->dev,
+			"Crystal oscillation stopped, time is not reliable\n");
 		return -EINVAL;
 	}
 
 	if (FIELD_GET(RX8111_FLAG_VLF_BIT, regval)) {
-		dev_warn(data->dev,
-			 "Low voltage detected, time is not reliable\n");
+		dev_dbg(data->dev,
+			"Low voltage detected, time is not reliable\n");
 		return -EINVAL;
 	}
 
···
 	}
 
 	if (regval) {
-		dev_warn(data->dev, "Clock stopped, time is not reliable\n");
+		dev_dbg(data->dev, "Clock stopped, time is not reliable\n");
 		return -EINVAL;
 	}