rtc: jz4740: Fix a typo in Kconfig

Fix typo introduced for RTC_DRV_JZ4740 in commit 586655d2 ("rtc:
jz4740: make the driver buildable as a module again").
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/Kconfig

@@ -1613,7 +1613,7 @@ config RTC_DRV_JZ4740
 	  If you say yes here you get support for the Ingenic JZ47xx SoCs RTC
 	  controllers.
 
-	  This driver can also be buillt as a module. If so, the module
+	  This driver can also be built as a module. If so, the module
 	  will be called rtc-jz4740.
 
 config RTC_DRV_LPC24XX