mtd: nand_base: Only use GET/SET FEATURES command on chips that support them.

Spansion's S34MLx chips support ONFI but not the GET/SET FEATURES calls.

Signed-off-by: David Mosberger <dmosberger@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

include/linux/mtd/nand.h

@@ -217,6 +217,9 @@ struct nand_chip;
 /* ONFI subfeature parameters length */
 #define ONFI_SUBFEATURE_PARAM_LEN	4
 
+/* ONFI optional commands SET/GET FEATURES supported? */
+#define ONFI_OPT_CMD_SET_GET_FEATURES	(1 << 2)
+
 struct nand_onfi_params {
 	/* rev info and features block */
 	/* 'O' 'N' 'F' 'I'  */