boards: hardkernel: odroid_go: fix PSRAM size

Booting the hello world sample fails with an error on the odroid go:

  I (124) quad_psram: This chip is ESP32-D0WD
  I (124) esp_psram: Found 4MB PSRAM device
  I (124) esp_psram: Speed: 40MHz
  I (125) esp_psram: PSRAM initialized, cache is in normal (1-core) mode.
  SPIRAM size is less than configured size, aborting.
  abort()

The device features only 32 Mbit PSRAM (4 MiB), see

  dts/xtensa/espressif/esp32/esp32_wrover_e_n16r4.dtsi

included from

  boards/hardkernel/odroid_go/odroid_go_procpu.dts

Signed-off-by: Gero Schwäricke <gero.schwaericke@posteo.de>
(cherry picked from commit db1adf4)

boards/hardkernel/odroid_go/Kconfig.defconfig

@@ -15,7 +15,7 @@ config ESP_SPIRAM
 	default y if !MCUBOOT
 
 choice SPIRAM_TYPE
-	default SPIRAM_TYPE_ESPPSRAM64
+	default SPIRAM_TYPE_ESPPSRAM32
 endchoice
 
 config HEAP_MEM_POOL_ADD_SIZE_BOARD