mtd: msm_qpic_nand: Get partition table from SMEM

At present kernel accesses the partition table from Device-Tree
which is populated by the bootloaders during boot-up.

Since the partition table is primarily availabile in SMEM, NAND driver
would directly parse it from SMEM instead of relying on bootloaders to
populate the Device-Tree. This in turn also saves up the bootup time.

CRs-Fixed: 440878
Change-Id: I79e3a96fc3bd0aef3b5771897073445df8f9275e
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>