platform: msm_shared: add function for number of pages per block

Add function for returning number of pages per block
of NAND memory.

Change-Id: I1009f43ae528d7753a65888a2563be7f98532c3f
diff --git a/include/dev/flash.h b/include/dev/flash.h
index 9c41561..f908db8 100644
--- a/include/dev/flash.h
+++ b/include/dev/flash.h
@@ -77,6 +77,8 @@
 {
 	return flash_read_ext(ptn, 0, offset, data, bytes);
 }
+
+unsigned flash_num_pages_per_blk(void);
 unsigned flash_page_size(void);
 unsigned flash_block_size(void);
 unsigned flash_spare_size(void);
diff --git a/platform/msm_shared/qpic_nand.c b/platform/msm_shared/qpic_nand.c
index baba30d..3fec647 100644
--- a/platform/msm_shared/qpic_nand.c
+++ b/platform/msm_shared/qpic_nand.c
@@ -1378,6 +1378,12 @@
 }
 
 unsigned
+flash_num_pages_per_blk(void)
+{
+	return flash.num_pages_per_blk;
+}
+
+unsigned
 flash_spare_size(void)
 {
     return flash.spare_size;