msm7627a: Update cache size to be 8M for 8 bit bch ecc NAND

As the no of pages per block is doubled for 8 bit bch NAND
increase the cache size accordingly. This is required for
recovery on 8 bit bch ecc NAND otherwise kernel fails to
mount cache partition.

Change-Id: I9786706bce0acddd3836f8ee9ccff8a828c3cfec
1 file changed