arch/risc-v/hpm6000: Use WDOGx naming for watchdog peripherals

Fix duplicate watchdog prompts in Kconfig by using unique WDOG0, WDOG1,
WDOG2 names instead of generic 'watchdog' label. This matches the UART
peripheral naming convention in the same file and makes it clear which
watchdog is being configured in menuconfig.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>

Author: no1wudi

arch/risc-v/src/hpm6000/Kconfig

@@ -34,15 +34,15 @@ config HPM_ENET
 menu "Watchdog"
 
 config HPM_WDOG0
-	bool "watchdog"
+	bool "WDOG0"
 	default n
 
 config HPM_WDOG1
-	bool "watchdog"
+	bool "WDOG1"
 	default n
 
 config HPM_WDOG2
-	bool "watchdog"
+	bool "WDOG2"
 	default n
 
 endmenu # Watchdog