drivers: systick: Add prompt for CORTEX_M_SYSTICK_RESET_BY_LPM

This commit adds a prompt to the Kconfig file to make
CORTEX_M_SYSTICK_RESET_BY_LPM option more visible to users
configuring the driver.

Signed-off-by: Zhaoxiang Jin <[email protected]>

Author: ZhaoxiangJin

drivers/timer/Kconfig.cortex_m_systick

@@ -97,7 +97,7 @@ endif # PM
 endchoice # CORTEX_M_SYSTICK_LPM_TIMER
 
 config CORTEX_M_SYSTICK_RESET_BY_LPM
-	bool
+	bool "SysTick reset by low-power mode"
 	depends on !CORTEX_M_SYSTICK_LPM_TIMER_NONE
 	help
 	  Some SoCs provide one or more low-power mode which, as part of their