rtc: max8907: Drop unused i2c include

rtc-max8907 is a platform driver that doesn't use any symbol provided in
<linux/i2c.h>. So drop the include.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221219081440.1399791-1-u.kleine-koenig@pengutronix.deSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-max8907.c

@@ -9,7 +9,6 @@
  */
 
 #include <linux/bcd.h>
-#include <linux/i2c.h>
 #include <linux/mfd/max8907.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>