[platform/msm_shared]: Fix the number of Nand Blocks generation.

Correct the supported flash devices array entries for two nand chips.
Use the correct supported flash devices array to fix the generation
of number of nand blocks present on the flash chip.

Change-Id: I7eabab5a2df28ffef0d4bc79c825401d78399bb8
diff --git a/target/qsd8250_surf/init.c b/target/qsd8250_surf/init.c
index 07428ca..540da0d 100644
--- a/target/qsd8250_surf/init.c
+++ b/target/qsd8250_surf/init.c
@@ -125,7 +125,7 @@
 	if (offset == 0xffffffff)
 	        while(1);
 
-	total_num_of_blocks = (flash_info->block_size)/NUM_PAGES_PER_BLOCK;
+	total_num_of_blocks = flash_info->num_blocks;
 
 	for (i = 0; i < num_parts; i++) {
 		struct ptentry *ptn = &board_part_list[i];