samples: boards: espressif: deep_sleep: add missing select GPIO

Kconfigs enabled functionality that requires GPIO, but they did not
select GPIO.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

samples/boards/espressif/deep_sleep/Kconfig

@@ -6,6 +6,7 @@ mainmenu "Espressif Deep Sleep demo"
 config EXAMPLE_EXT1_WAKEUP
 	bool "Enable wakeup from GPIO"
 	depends on !SOC_SERIES_ESP32C3
+	select GPIO
 	help
 	  This option enables wake-up from deep sleep using GPIO2 and
 	  GPIO4. The sample enables internal pull-down on EXT1 pins to
@@ -16,6 +17,7 @@ config EXAMPLE_EXT1_WAKEUP
 config EXAMPLE_GPIO_WAKEUP
 	bool "Enable wakeup from GPIO"
 	depends on SOC_SERIES_ESP32C3
+	select GPIO
 	help
 	  This option enables wake-up from GPIO. Only GPIO0~5 can be used
 	  as wake-up source. Be aware that when low level is used to trigger