mtd: msm_qpic_nand: Add snapshot of QPIC nand driver

Add snapshot of QPIC nand driver and it's supported files, for
QPIC based NAND controller. This is snapshot of the QPIC nand driver
as of msm-3.18 'commit 5482aea0982d ("cnss2: Fix a bug in athdiag
read QMI message")'. Also, fix minor compilation and sparse issues
on msm-4.9 kernel.

Change-Id: I865d5e63e06bd60f3b04bfa14d0c4fb6c618cb21
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>