drivers: rtc: update the RTC menuconfig title to unified format

Update the RTC driver menuconfig title to match the unified format
introduced in c41dd36de2.

Move the RTC driver menuconfig entry so the menuconfig list is still
(mostly) alphabetically sorted.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>

drivers/Kconfig

@@ -64,6 +64,7 @@ source "drivers/pwm/Kconfig"
 source "drivers/regulator/Kconfig"
 source "drivers/reset/Kconfig"
 source "drivers/retained_mem/Kconfig"
+source "drivers/rtc/Kconfig"
 source "drivers/sdhc/Kconfig"
 source "drivers/sensor/Kconfig"
 source "drivers/serial/Kconfig"
@@ -78,6 +79,5 @@ source "drivers/w1/Kconfig"
 source "drivers/watchdog/Kconfig"
 source "drivers/wifi/Kconfig"
 source "drivers/xen/Kconfig"
-source "drivers/rtc/Kconfig"
 
 endmenu

drivers/rtc/Kconfig

@@ -2,7 +2,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
 menuconfig RTC
-	bool "RTC driver support"
+	bool "Real-Time Clock (RTC) drivers"
+	help
+	  Enable RTC driver configuration.
 
 if RTC