build: increase FetchContent timeout to 120 seconds for LVGL

LVGL 9.2.1 archive is ~70MB. Over poor connections, it may take
longer to download it. This renders CMake build unusable in such
environments.

Signed-off-by: Daniel Jasinski <jasinskidaniel95szcz@gmail.com>

Author: Jasinsky

graphics/lvgl/CMakeLists.txt

@@ -43,7 +43,7 @@ if(CONFIG_GRAPHICS_LVGL)
           TEST_COMMAND
           ""
       DOWNLOAD_NO_PROGRESS true
-      TIMEOUT 30)
+      TIMEOUT 120)
 
     FetchContent_GetProperties(lvgl_fetch)