lightnvm: add 2.0 geometry identification

Implement the geometry data structures for 2.0 and enable a drive
to be identified as one, including exposing the appropriate 2.0
sysfs entries.

Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/lightnvm.h

@@ -184,10 +184,9 @@ struct nvm_id {
 	u16	csecs;
 	u16	sos;
 
-	u16	ws_min;
-	u16	ws_opt;
-	u16	ws_seq;
-	u16	ws_per_chk;
+	u32	ws_min;
+	u32	ws_opt;
+	u32	mw_cunits;
 
 	u32	trdt;
 	u32	trdm;
@@ -199,6 +198,10 @@ struct nvm_id {
 	u32	mccap;
 	u16	cpar;
 
+	/* calculated values */
+	u16	ws_seq;
+	u16	ws_per_chk;
+
 	/* 1.2 compatibility */
 	u8	mtype;
 	u8	fmtype;