rtc: ds1307: remove flags

flags is now unused, drop it.
Tested-by: Łukasz Stelmach <l.stelmach@samsung.com>
Reviewed-by: Łukasz Stelmach <l.stelmach@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210418000023.995758-2-alexandre.belloni@bootlin.com

drivers/rtc/rtc-ds1307.c

@@ -169,8 +169,6 @@ enum ds_type {
 
 struct ds1307 {
 	enum ds_type		type;
-	unsigned long		flags;
-#define HAS_NVRAM	0		/* bit 0 == sysfs file active */
 	struct device		*dev;
 	struct regmap		*regmap;
 	const char		*name;