ae3xx: timer: Rename AE3XX to ATCPIT100

ATCPIT100 is Andestech timer IP which is embeded
in AE3XX and AE250 boards. So rename AE3XX to
ATCPIT100 will be more make sence.

Signed-off-by: rick <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 6305bbf..fcfdf4e 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -105,11 +105,12 @@
 	help
 	  Select this to enable a timer for AG01P devices.
 
-config AE3XX_TIMER
-	bool "AE3XX timer support"
+config ATCPIT100_TIMER
+	bool "ATCPIT100 timer support"
 	depends on TIMER && NDS32
 	help
-	  Select this to enable a timer for AE3XX devices.
+	  Select this to enable a ATCPIT100 timer which will be embeded
+		in AE3XX, AE250 boards.
 
 config ROCKCHIP_TIMER
         bool "Rockchip timer support"