mtd: rawnand: Deprecate the ->select_chip() hook

Now that the CS line to be selected is passed to ->exec_op() and
stored in chip->cur_cs and after patching all drivers implementing
->exec_op() to stop implementing this method, we can deprecate it by
moving it to the nand_legacy structure.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Tested-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c
index 3a4c373..53f57e0 100644
--- a/drivers/mtd/nand/raw/diskonchip.c
+++ b/drivers/mtd/nand/raw/diskonchip.c
@@ -1390,7 +1390,7 @@
 	this->legacy.read_buf = doc2001plus_readbuf;
 	doc->late_init = inftl_scan_bbt;
 	this->legacy.cmd_ctrl = NULL;
-	this->select_chip = doc2001plus_select_chip;
+	this->legacy.select_chip = doc2001plus_select_chip;
 	this->legacy.cmdfunc = doc2001plus_command;
 	this->ecc.hwctl = doc2001plus_enable_hwecc;
 
@@ -1568,7 +1568,7 @@
 	mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
 
 	nand_set_controller_data(nand, doc);
-	nand->select_chip	= doc200x_select_chip;
+	nand->legacy.select_chip	= doc200x_select_chip;
 	nand->legacy.cmd_ctrl		= doc200x_hwcontrol;
 	nand->legacy.dev_ready	= doc200x_dev_ready;
 	nand->legacy.waitfunc	= doc200x_wait;