examples/gnrc/mqtt/paho-mqtt: disable WiFi for ESP32-H2

Author: gschorcht

examples/networking/mqtt/paho-mqtt/Makefile.board.dep

@@ -1,7 +1,10 @@
 # Put board specific dependencies here
 
 ifneq (,$(filter arch_esp,$(FEATURES_USED)))
-  USEMODULE += esp_wifi
+  ifneq (esp32h2,$(CPU_FAM))
+    # ESP32-H2 doesn't have WiFi module
+    USEMODULE += esp_wifi
+  endif
 endif
 
 ifneq (,$(filter native native32 native64,$(BOARD)))