Fix Arm(R) Ethos(TM)-U55 NPU Demo app

- Avoid installing TVM python and all its dependencies

Change-Id: Iaa4dd5429871f02961cac12476f9dc46091bcb34

apps/microtvm/ethosu/run_demo.sh

@@ -128,7 +128,9 @@ mobilenet_url='https://storage.googleapis.com/download.tensorflow.org/models/mob
 curl --retry 64 -sSL ${mobilenet_url} | gunzip | tar -xvf - ./mobilenet_v1_1.0_224_quant.tflite
 
 # Compile model for Arm(R) Cortex(R)-M55 CPU and Ethos(TM)-U55 NPU
-tvmc compile --target="ethos-u -accelerator_config=ethos-u55-256, \
+# An alternative to using "python3 -m tvm.driver.tvmc" is to call
+# "tvmc" directly once TVM has been pip installed.
+python3 -m tvm.driver.tvmc compile --target="ethos-u -accelerator_config=ethos-u55-256, \
     c -runtime=c --link-params -mcpu=cortex-m55 -executor=aot -interface-api=c -unpacked-api=1" \
     --pass-config tir.disable_vectorize=1 ./mobilenet_v1_1.0_224_quant.tflite --output-format=mlf
 tar -xvf module.tar

tests/scripts/task_cpp_unittest.sh

@@ -48,9 +48,8 @@ cd ../..
 
 # Test Arm(R) Cortex(R)-M55 CPU and Ethos(TM)-U55 NPU demo app
 FVP_PATH="/opt/arm/FVP_Corstone_SSE-300_Ethos-U55"
-VELA_INSTALLED=$(pip3 list | grep vela)
-if [ -d $FVP_PATH ] && [ -n "$VELA_INSTALLED" ]; then
-    sudo pip3 install -e python
+VELA_INSTALLED="$(pip3 list | grep vela)"
+if test -d $FVP_PATH && test -n "$VELA_INSTALLED"; then
     cd apps/microtvm/ethosu
     ./run_demo.sh --fvp_path $FVP_PATH --cmake_path /opt/arm/cmake/bin/cmake
     cd ../../..