Fix the SPIRAM_BANKSWITCH that was defined incorrectly

arch/xtensa/src/esp32/Kconfig

@@ -591,7 +591,7 @@ config ESP32_SPIRAM_2T_MODE
 	    Applications will not be affected unless the use the esp_himem
 	    APIs, which are not supported in 2T mode.
 
-config SPIRAM_BANKSWITCH_ENABLE
+config ESP32_SPIRAM_BANKSWITCH_ENABLE
 	bool "Enable bank switching for >4MiB external RAM"
 	default y
 	help
@@ -610,7 +610,7 @@ config SPIRAM_BANKSWITCH_ENABLE
 
 config SPIRAM_BANKSWITCH_RESERVE
 	int "Amount of 32K pages to reserve for bank switching"
-	depends on SPIRAM_BANKSWITCH_ENABLE
+	depends on ESP32_SPIRAM_BANKSWITCH_ENABLE
 	default 8
 	range 1 62
 	help

arch/xtensa/src/esp32/esp32_himem.c

@@ -70,7 +70,7 @@
 
 /* How many 32KB pages will be reserved for bank switch */
 
-#if CONFIG_SPIRAM_BANKSWITCH_ENABLE
+#if CONFIG_ESP32_SPIRAM_BANKSWITCH_ENABLE
 #  define SPIRAM_BANKSWITCH_RESERVE CONFIG_SPIRAM_BANKSWITCH_RESERVE
 #else
 #  define SPIRAM_BANKSWITCH_RESERVE 0

boards/xtensa/esp32/esp32-core/src/esp32_bringup.c

@@ -143,7 +143,8 @@ int esp32_bringup(void)
 
 #endif
 
-#if defined(CONFIG_ESP32_SPIRAM)
+#if defined(CONFIG_ESP32_SPIRAM) && \
+    defined(CONFIG_ESP32_SPIRAM_BANKSWITCH_ENABLE)
   ret = esp_himem_init();
   if (ret < 0)
     {