mtd: msm_qpic_nand: Enable Pagescope read feature and reset status_desc

Enable Pagescope read feature and reset status_desc variable upon every
page read. This makes status_desc variable points to correct memory for
status register values for every page count.

Change-Id: Ic9b5f81de11ca5a249302570bf4b7f38d96b4e38
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>