gbproxy: Remove test testing NSVCI change

This was overlooked in commit 82182d which already removed lots of
NS-specific code in gbproxy_test.c

From that commit message:
"""
Since NS2 has a different abstraction we mock up the prim send/recv
functions and don't test NS like the old tests did.
"""

Change-Id: Ic1d7e646e633c9fa62812f5005ed10c0108a06f2
Related: SYS#5226
2 files changed