Merge pull request #1880 from ucb-bar/classpath_fixes

Fix classpath_cache bug

build.sbt

@@ -331,6 +331,6 @@ lazy val fpga_shells = (project in file("./fpga/fpga-shells"))
   .settings(libraryDependencies ++= rocketLibDeps.value)
   .settings(commonSettings)
 
-lazy val fpga_platforms = (project in file("./fpga"))
+lazy val chipyard_fpga = (project in file("./fpga"))
   .dependsOn(chipyard, fpga_shells)
   .settings(commonSettings)