mtd: msm_qpic_nand: get ecc correctable bits

The ECC correctable number of bit can be specified as part of the NAND ID
table. Use that to set the ECC correctable bit in NAND controller.

Change-Id: I06690fb46e1fb5120a3912e365b00726a04bb707
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>