driver/segger: Simplify serial driver configuation

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

Author: xiaoxiang781216

drivers/segger/Kconfig

@@ -123,56 +123,59 @@ config SYSLOG_RTT
 		Use Segger J-Link RTT as a SYSLOG output device.
 
 config SERIAL_RTT
-	bool "Segger RTT serial driver"
+	bool
 	select SEGGER_RTT
 	select SERIAL_RXDMA
 	select SERIAL_TXDMA
-	depends on SERIAL
 	default n
 	---help---
 		This option is used to enable RTT serial device
 		In Segger RTT serial driver, RTT channel buffer and serial DMA buffer are shared,
 		So you cannot use RTT stream to operate it
 
-if SERIAL_RTT
-
 config SERIAL_RTT_POLLING_INTERVAL
 	int "Segger RTT serial pilling interval (us)"
+	depends on SERIAL_RTT
 	default USEC_PER_TICK
 	---help---
 		This option is used to configure the RTT serial polling interval
 
 config SERIAL_RTT0
 	bool "Segger RTT serial for channel 0"
+	select SERIAL_RTT
+	depends on SERIAL
 	default n
 	---help---
 		This option is used to enable the serial driver of channel 0
 
 config SERIAL_RTT1
 	bool "Segger RTT serial for channel 1"
+	select SERIAL_RTT
+	depends on SERIAL
 	default n
-	depends on SEGGER_RTT_MAX_NUM_DOWN_BUFFERS >= 2
 	---help---
 		This option is used to enable the serial driver of channel 1
 
 config SERIAL_RTT2
 	bool "Segger RTT serial for channel 2"
+	select SERIAL_RTT
+	depends on SERIAL
 	default n
-	depends on SEGGER_RTT_MAX_NUM_DOWN_BUFFERS >= 3
 	---help---
 		This option is used to enable the serial driver of channel 2
 
 config SERIAL_RTT_CONSOLE
 	int "Segger RTT console channel"
+	depends on SERIAL_RTT
 	default 0 if SERIAL_RTT0
+	default 1 if SERIAL_RTT1
+	default 2 if SERIAL_RTT2
 	default -1
 	---help---
 		Select RTT console channel, using RTT channel 0 by default.
 		The buffer size of RTT channel 0 is configured by SEGGER_RTT_BUFFER_SIZE_UP/DOWN
 		You need to turn off other console devices before using Segger RTT console
 
-endif # SERIAL_RTT
-
 if DRIVERS_NOTE
 
 config NOTE_RTT