http_server: fix sdmmc related build error for esp32s2beta

ESP32S2 does not have sdmmc, disable SD host for esp32s2

examples/protocols/http_server/restful_server/main/Kconfig.projbuild

@@ -21,6 +21,7 @@ menu "Example Configuration"
                 Deploy website to host.
                 It is recommended to choose this mode during developing.
         config EXAMPLE_WEB_DEPLOY_SD
+            depends on IDF_TARGET_ESP32
             bool "Deploy website to SD card"
             help
                 Deploy website to SD card.

examples/protocols/http_server/restful_server/main/esp_rest_main.c

@@ -7,7 +7,6 @@
    CONDITIONS OF ANY KIND, either express or implied.
 */
 #include "sdkconfig.h"
-#include "driver/sdmmc_host.h"
 #include "driver/gpio.h"
 #include "esp_vfs_semihost.h"
 #include "esp_vfs_fat.h"
@@ -20,6 +19,9 @@
 #include "mdns.h"
 #include "lwip/apps/netbiosns.h"
 #include "protocol_examples_common.h"
+#if CONFIG_EXAMPLE_WEB_DEPLOY_SD
+#include "driver/sdmmc_host.h"
+#endif
 
 #define MDNS_INSTANCE "esp home web server"