mtd: remove MEMSETOOBSEL macro definition

MEMSETOOBSEL is completely unused and useless. Remove the definition.

Note: it's probably best not to use this ioctl number in the future for
MTD, since that may cause conflicts between old kernels and new user
software (or new kernels and old user software).

Artem: leave a comment about MEMSETOOBSEL.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>

include/mtd/mtd-abi.h

@@ -104,6 +104,12 @@ struct otp_info {
 	__u32 locked;
 };
 
+/*
+ * Note, the following ioctl existed in the past and was removed:
+ * #define MEMSETOOBSEL           _IOW('M', 9, struct nand_oobinfo)
+ * Try to avoid adding a new ioctl with the same ioctl number.
+ */
+
 #define MEMGETINFO		_IOR('M', 1, struct mtd_info_user)
 #define MEMERASE		_IOW('M', 2, struct erase_info_user)
 #define MEMWRITEOOB		_IOWR('M', 3, struct mtd_oob_buf)
@@ -112,7 +118,6 @@ struct otp_info {
 #define MEMUNLOCK		_IOW('M', 6, struct erase_info_user)
 #define MEMGETREGIONCOUNT	_IOR('M', 7, int)
 #define MEMGETREGIONINFO	_IOWR('M', 8, struct region_info_user)
-#define MEMSETOOBSEL		_IOW('M', 9, struct nand_oobinfo)
 #define MEMGETOOBSEL		_IOR('M', 10, struct nand_oobinfo)
 #define MEMGETBADBLOCK		_IOW('M', 11, __kernel_loff_t)
 #define MEMSETBADBLOCK		_IOW('M', 12, __kernel_loff_t)