[JVMCI] restore original qualified exports to Graal

The changes to src/jdk.internal.vm.ci/share/classes/module-info.java in JDK-8267112 broke the use case of running Graal-optimized Truffle on OracleJDK (https://www.graalvm.org/reference-manual/js/RunOnJDK/):

Exception in thread "main" java.lang.IllegalAccessError: class org.graalvm.libgraal.LibGraal (in module jdk.internal.vm.compiler) cannot access class jdk.vm.ci.hotspot.HotSpotJVMCIRuntime (in module jdk.internal.vm.ci) because module jdk.internal.vm.ci does not export jdk.vm.ci.hotspot to module jdk.internal.vm.compiler
        at jdk.internal.vm.compiler/org.graalvm.libgraal.LibGraal.<clinit>(LibGraal.java:49)
        at jdk.internal.vm.compiler/org.graalvm.compiler.truffle.runtime.hotspot.libgraal.LibGraalTruffleRuntimeAccess.getPriority(LibGraalTruffleRuntimeAccess.java:44)
        at org.graalvm.truffle/com.oracle.truffle.api.Truffle.selectTruffleRuntimeAccess(Truffle.java:89)

Restoring the qualified exports resolves this problem.