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
diff --git a/platform/msm_shared/qpic_nand.c b/platform/msm_shared/qpic_nand.c
index df8480d..43bbc78 100644
--- a/platform/msm_shared/qpic_nand.c
+++ b/platform/msm_shared/qpic_nand.c
@@ -1296,6 +1296,12 @@
 }
 
 unsigned
+flash_num_pages_per_blk(void)
+{
+	return flash.num_pages_per_blk;
+}
+
+unsigned
 flash_page_size(void)
 {
 	return flash.page_size;