mtd: nand: Mark reserved blocks

mtd: nand: Mark reserved blocks

Reserved blocks are used for storing bad block tables. With "nand bad"
command, these reserved blocks are shown as bad blocks. This is leading
to confusion when compared with Linux bad blocks. Hence, display
"bbt reserved" when printing reserved blocks with "nand bad" command.

To acheive this, return 2 which represents reserved from nand_isbad_bbt()
instead of 1 in case of reserved blocks and catch it in cmd/nand.c.

"nand bad" command display's hexadecimal numbers, so add "0x" prefix.

Example log will show up as below.

ZynqMP> nand bad

Device 0 bad blocks:
  0x00400000
  0x16800000
  0x16c00000
  0x17000000
  0x3d800000
  0x3e400000
  0xe8400000
  0xff000000	 (bbt reserved)
  0xff400000	 (bbt reserved)
  0xff800000	 (bbt reserved)
  0xffc00000	 (bbt reserved)
  0x116800000
  0x116c00000
  0x1ff000000	 (bbt reserved)
  0x1ff400000	 (bbt reserved)
  0x1ff800000	 (bbt reserved)
  0x1ffc00000	 (bbt reserved)

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Acked-By: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>