rtc: Kconfig: properly indent sd3078 entry

The RTC_DRV_SD3078 is indented using spaces, use tabs instead.

Link: https://lore.kernel.org/r/20200127221724.10160-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/Kconfig

@@ -676,13 +676,13 @@ config RTC_DRV_S5M
 	  will be called rtc-s5m.
 
 config RTC_DRV_SD3078
-    tristate "ZXW Shenzhen whwave SD3078"
-    help
-      If you say yes here you get support for the ZXW Shenzhen whwave
-      SD3078 RTC chips.
+	tristate "ZXW Shenzhen whwave SD3078"
+	help
+	  If you say yes here you get support for the ZXW Shenzhen whwave
+	  SD3078 RTC chips.
 
-      This driver can also be built as a module. If so, the module
-      will be called rtc-sd3078
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-sd3078
 
 endif # I2C