Remove ethosu_core and ethosu_applications

Interface libraries ethosu_core and ethosu_applications are removed.
Each application shall depend directly on the libraries they need.

Change-Id: I1721ea0fd3c79e74da5e131a60f7aa24277c99ba
diff --git a/cmake/helpers.cmake b/cmake/helpers.cmake
index 8e0a8c3..a21d9f0 100644
--- a/cmake/helpers.cmake
+++ b/cmake/helpers.cmake
@@ -96,7 +96,7 @@
     endif()
 
     target_link_libraries(${target} PRIVATE
-        ${ARGS_TARGET_LIBRARY} ethosu_core ${ARGS_LIBRARIES})
+        ${ARGS_TARGET_LIBRARY} ${ARGS_LIBRARIES})
 
     ethosu_eval_link_options(${target})