This removes the explicit mention of SwiftShader in Reactor's code,
while still allowing to set a name that identifies the usage precisely.

Bug: b/174801963
Change-Id: Ic6cdd9d36ef9093aea62f571ecd37334ec32d3f2
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/50890Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>