This change updates the gem5 SST bridge to call m5.instantiate() in the gem5 config script instead of in the SST component. This allows more flexibility for the gem5-SST setup, as we can now write traffic generators using the bridge. Change-Id: I510a8c15f8fb00bdbdd60dafa2d9f5ad011e48f2 Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu>