lightnvm: pblk: add SPDX license tag

Add GLP-2.0 SPDX license tag to all pblk files
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-cache.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-gc.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-init.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2015 IT University of Copenhagen (rrpc.c)
  * Copyright (C) 2016 CNEX Labs

drivers/lightnvm/pblk-map.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-rb.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-read.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-recovery.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-rl.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-sysfs.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk-write.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2016 CNEX Labs
  * Initial release: Javier Gonzalez <javier@cnexlabs.com>

drivers/lightnvm/pblk.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (C) 2015 IT University of Copenhagen (rrpc.h)
  * Copyright (C) 2016 CNEX Labs