Added extra flatc variables used by NPU (#22620)

### Details:
- Required to build NPU and OpenVINO in a single shot for wheel packages

### Tickets:
- CVS-130134

thirdparty/dependencies.cmake

@@ -400,6 +400,10 @@ if(ENABLE_OV_TF_LITE_FRONTEND)
         set(flatbuffers_COMPILER flatbuffers::flatc)
     else()
         add_subdirectory(thirdparty/flatbuffers EXCLUDE_FROM_ALL)
+
+        # used by NPU repo
+        set(flatc_COMMAND flatc)
+        set(flatc_TARGET flatc)
     endif()
 
     # set additional variables, used in other places of our cmake scripts

thirdparty/flatbuffers/CMakeLists.txt

@@ -3,8 +3,6 @@
 #
 
 set(FLATBUFFERS_BUILD_TESTS OFF CACHE BOOL "" FORCE)
-set(FLATBUFFERS_BUILD_FLATLIB OFF CACHE BOOL "" FORCE)
-set(FLATBUFFERS_BUILD_FLATHASH OFF CACHE BOOL "" FORCE)
 set(FLATBUFFERS_INSTALL OFF CACHE BOOL "" FORCE)
 set(FLATBUFFERS_CPP_STD ${CMAKE_CXX_STANDARD})
 
@@ -35,9 +33,10 @@ else()
         TARGET_NAME host_flatc
         NATIVE_INSTALL_DIR "${HOST_FLATC_INSTALL_DIR}"
         CMAKE_ARGS "-DFLATBUFFERS_BUILD_TESTS=${FLATBUFFERS_BUILD_TESTS}"
-                   "-DFLATBUFFERS_BUILD_FLATLIB=${FLATBUFFERS_BUILD_FLATLIB}"
+                   "-DFLATBUFFERS_BUILD_FLATLIB=OFF"
+                   "-DFLATBUFFERS_BUILD_FLATC=ON"
+                   "-DFLATBUFFERS_BUILD_SHAREDLIB=OFF"
                    "-DFLATBUFFERS_CPP_STD=${FLATBUFFERS_CPP_STD}"
-                   "-DFLATBUFFERS_BUILD_FLATHASH=${FLATBUFFERS_BUILD_FLATHASH}"
         NATIVE_SOURCE_SUBDIR "flatbuffers"
         NATIVE_TARGETS flatc)