soc: st: stm32: allow disabling ENABLE_DEBUG_SLEEP_STOP when DEBUG=y

Use an override-able 'default' for CONFIG_STM32_ENABLE_DEBUG_SLEEP_STOP
rather than forcefully 'select'ing the symbol when CONFIG_DEBUG=y, as
there are situations where one might want CONFIG_DEBUG=y without inhibiting
low-power mode entry.

Signed-off-by: Mathieu Choplain <mathieu.choplain-ext@st.com>

Author: mathieuchopstm

soc/st/stm32/Kconfig

@@ -3,7 +3,7 @@
 
 config SOC_FAMILY_STM32
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
-	select STM32_ENABLE_DEBUG_SLEEP_STOP if DEBUG || ZTEST
+	select STM32_ENABLE_DEBUG_SLEEP_STOP if ZTEST
 	select BUILD_OUTPUT_HEX
 
 if SOC_FAMILY_STM32
@@ -40,6 +40,7 @@ config STM32_BACKUP_SRAM_INIT_PRIORITY
 
 config STM32_ENABLE_DEBUG_SLEEP_STOP
 	bool "Allow debugger attach in stop/sleep Mode"
+	default y if DEBUG
 	help
 	  Some STM32 parts disable the DBGMCU in sleep/stop modes because
 	  of power consumption. As a side-effects this prevents