[microNPU] Enforce bias when pattern matching conv2d (#9244)
[microNPU] Enforce bias when pattern matching conv2d (#9244)

Currently a conv2d pattern is matched when no bias is present.
However, legalization expects a bias to be present, therefore
causing an error when this is not the case. For now, enforce a
bias when offloading conv2d to the NPU.

Change-Id: I7f74b0f2c151f51ddc66ee1c5ebb77534238909b
dmlc/tvm,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1