mtd: rawnand: Remove unused NAND_CONTROLLER_ALLOC flag

Looks like NAND_CONTROLLER_ALLOC has been introduced a long time ago
back when the dummy nand_hw_ctrl object was dynamically allocated
instead of being embedded in nand_chip.

We can safely get rid of this unused flag.
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>

include/linux/mtd/rawnand.h

@@ -203,10 +203,6 @@ enum nand_ecc_algo {
  */
 #define NAND_IS_BOOT_MEDIUM	0x00400000
 
-/* Options set by nand scan */
-/* Nand scan has allocated controller struct */
-#define NAND_CONTROLLER_ALLOC	0x80000000
-
 /* Cell info constants */
 #define NAND_CI_CHIPNR_MSK	0x03
 #define NAND_CI_CELLTYPE_MSK	0x0C