libata: implement SECURITY PROTOCOL IN/OUT

This allows us to use the generic OPAL code with ATA devices.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/include/linux/ata.h b/include/linux/ata.h
index c14bdcf..e65ae4b 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -341,6 +341,7 @@
 	ATA_LOG_IDENTIFY_DEVICE	= 0x30,
 
 	/* Identify device log pages: */
+	ATA_LOG_SECURITY	  = 0x06,
 	ATA_LOG_SATA_SETTINGS	  = 0x08,
 	ATA_LOG_ZONED_INFORMATION = 0x09,