Arm backend: Enable parallel building on MLSDK emulation layer (#15037)

Change-Id: I857bad698f234d803cd930325d908a720f7433ab


cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

Signed-off-by: Ryan O'Shea <[email protected]>
Co-authored-by: Ryan OShea <[email protected]>

Author: pytorchbot

backends/arm/scripts/mlsdk_utils.sh

@@ -131,7 +131,7 @@ function setup_mlsdk() {
             -DSPIRV_TOOLS_PATH=../../dependencies/SPIRV-Tools        \
             -DVULKAN_HEADERS_PATH=../../dependencies/Vulkan-Headers
 
-        cmake --build build
+        cmake --build build -j$(nproc)
         cmake --install build --prefix deploy
         popd
     fi