cmake: fixing include recursion when llext=n

When llext is disabled lext-edk include file generation had a recursion
bug

Signed-off-by: Andrea Gilardoni <a.gilardoni@arduino.cc>

Author: andreagilardoni

CMakeLists.txt

@@ -12,7 +12,7 @@ if (CONFIG_ARDUINO_API)
 endif()
 endif()
 
-if (CONFIG_ARDUINO_API AND NOT CONFIG_LLEXT)
+if (CONFIG_ARDUINO_API AND NOT CONFIG_LLEXT_EDK)
 add_subdirectory(cores)
 add_subdirectory(libraries)
 zephyr_include_directories(${variant_dir})