app: aboot: add size check when flashing on NAND

Added size check during flashing on NAND memory so that
nothing is written beyond the intended partition.

Change-Id: Ie1d3307fb8f7631d2b33a372c0683484f82c1cd2

FPIIM-1224

Change-Id: I0a28b488406f0595cd8ae9034dee8b3372d0e920
3 files changed