mtd: rawnand: add defines for ONFI version bits

Add defines for the ONFI version bits and use them in
nand_flash_detect_onfi().

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f362c09..dbf6e80 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5174,15 +5174,15 @@
 
 	/* Check version */
 	val = le16_to_cpu(p->revision);
-	if (val & (1 << 5))
+	if (val & ONFI_VERSION_2_3)
 		chip->parameters.onfi.version = 23;
-	else if (val & (1 << 4))
+	else if (val & ONFI_VERSION_2_2)
 		chip->parameters.onfi.version = 22;
-	else if (val & (1 << 3))
+	else if (val & ONFI_VERSION_2_1)
 		chip->parameters.onfi.version = 21;
-	else if (val & (1 << 2))
+	else if (val & ONFI_VERSION_2_0)
 		chip->parameters.onfi.version = 20;
-	else if (val & (1 << 1))
+	else if (val & ONFI_VERSION_1_0)
 		chip->parameters.onfi.version = 10;
 
 	if (!chip->parameters.onfi.version) {