mtd: msm_qpic_nand: Fix trival compilation errors

Fix the minor compilation errors: mixing declarations and
code [-Wdeclaration-after-statement] in nand driver.

Change-Id: I5dc76a47cc13b3246f9ecb8d24cf3a758a8b8bd1
Signed-off-by: Pradeep P V K <pragalla@codeaurora.org>