fix(esp_modem): specify override_path in example manifest files

components/esp_modem/examples/linux_modem/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.5)
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 
-set(EXTRA_COMPONENT_DIRS ../.. ../../port/linux)
+set(EXTRA_COMPONENT_DIRS ../../port/linux)
 
 set(COMPONENTS main)
 project(linux_modem)

components/esp_modem/examples/linux_modem/main/idf_component.yml

@@ -0,0 +1,4 @@
+dependencies:
+  espressif/esp_modem:
+    version: "^1.0.1"
+    override_path: "../../../"