lightnvm: Add CRC read error

Let the host differentiate between a read error and a CRC check error on
the device side.
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

include/linux/lightnvm.h

@@ -107,6 +107,7 @@ enum {
 	NVM_RSP_ERR_FAILWRITE	= 0x40ff,
 	NVM_RSP_ERR_EMPTYPAGE	= 0x42ff,
 	NVM_RSP_ERR_FAILECC	= 0x4281,
+	NVM_RSP_ERR_FAILCRC	= 0x4004,
 	NVM_RSP_WARN_HIGHECC	= 0x4700,
 
 	/* Device opcodes */