sw:vec_iree: Disable building IREE upstream samples

IREE samples has additional target_add_link_libraries flag, which works
agains our springbok BSP linker setting. We have our samples in a good
shape so we don't need to build the upstream sample anymore.

Change-Id: I196aa8590b87b32c4c527ee5d5787988671448fd

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f9dfd0b..00cd065 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,7 +39,7 @@
 #-------------------------------------------------------------------------------
 set(IREE_BUILD_COMPILER OFF)
 set(IREE_ENABLE_MLIR OFF)
-set(IREE_BUILD_SAMPLES ON)
+set(IREE_BUILD_SAMPLES OFF)
 set(IREE_ENABLE_THREADING OFF)
 set(IREE_BUILD_TESTS OFF)
 set(IREE_BUILD_BINDINGS_TFLITE OFF)