Similar to #8355391 and #8356021, sun.nio.ch.FileKey/sun.nio.fs.UnixFileKey/sun.nio.fs.UnixFileStore in java.base can also be simplified similarly.

Replace manual bitwise operations in hashCode implementations of sun.nio.ch.FileKey/sun.nio.fs.UnixFileKey/sun.nio.fs.UnixFileStore with Long::hashCode.