rtc: remove nvmem_config

Because nvmem_config is only used and copied at nvmem registration, remove
it from struct rtc_device.

All the rtc drivers using nvmem are now calling rtc_nvmem_register
directly.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/class.c

@@ -454,8 +454,6 @@ int __rtc_register_device(struct module *owner, struct rtc_device *rtc)
 
 	rtc_proc_add_device(rtc);
 
-	rtc_nvmem_register(rtc, rtc->nvmem_config);
-
 	rtc->registered = true;
 	dev_info(rtc->dev.parent, "registered as %s\n",
 		 dev_name(&rtc->dev));

include/linux/rtc.h

@@ -145,7 +145,6 @@ struct rtc_device {
 
 	bool registered;
 
-	struct nvmem_config *nvmem_config;
 	struct nvmem_device *nvmem;
 	/* Old ABI support */
 	bool nvram_old_abi;