update hcs.Start to use HCS V1 API (#2729)

Presently, the implementation of Start method used computecore i.e. HCS V2 for starting the compute system. However, the same compute system was created using HCS V1 and therefore, due to an incompatibility within HCS between V1 and V2 APIs, this was failing.

Therefore, as a stop gap, we have reverted the Start method to use the HCS V1 API. During our full scale migration to V2 APIs, this will be taken care of properly.

Signed-off-by: Harsh Rawat <harshrawat@microsoft.com>

# Conflicts:
#	internal/hcs/system.go

Author: rawahars