adapt to new config structure

Co-authored-by: Austin <vidplace7@gmail.com>

variants/esp32c6/m5stack_unitc6l/platformio.ini

@@ -15,7 +15,7 @@ lib_deps =
 build_flags = 
   ${esp32c6_base.build_flags}
   -D PRIVATE_HW
-  -I variants/m5stack_unitc6l
+  -I variants/esp32c6/m5stack_unitc6l
   -DMESHTASTIC_EXCLUDE_PAXCOUNTER=1
   -DMESHTASTIC_EXCLUDE_BLUETOOTH=1
   -DHAS_BLUETOOTH=0