blackfin: Platfrom NAND: Set blackfin GPIO as input for NAND ready signal

From: Frank.Shew <fshew@geometrics.com>

fix the following problem:having extremely slow responses with the NAND
due to timeouts on the ready status signal, which eventually
caused the watchdog to time out.

Signed-off-by: Aaron Wu <Aaron.Wu@analog.com>
Signed-off-by: Steven Miao <realmz6@gmail.com>
blackfin: rename vmImage to uImage after we move to buildroot

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Steven Miao <realmz6@gmail.com>
blackfin: bf60x: fix typo "CONFIG_PM_BFIN_WAKE_PA15_POL"

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Steven Miao <realmz6@gmail.com>