mtd: msm_qpic_nand: Remove the SW workaround on sdxlemur

Software workaround for Pagescope read feature was no more
needed on sdxlemur. Hence remove the SW workaround.

Change-Id: Iafde459c9270c3ff208e6464fcad5440bbe62594
Signed-off-by: Pradeep P V K <pragalla@codeaurora.org>