platform : msm_shared : Modified mmc_page_size() function

Modified mmc_page_size() so as to prevent oob read in boot_verify_image
and such that it passes page size from image.

Change-Id: I2159e3d506bd156e7248ca3b849d930967bf2af8
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index f0158ab..5d522f8 100644
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -240,7 +240,14 @@
 #endif
 /*As per spec delay wait time before shutdown in Red state*/
 #define DELAY_WAIT 30000
-static unsigned page_size = 0;
+static unsigned page_size = BOARD_KERNEL_PAGESIZE;
+
+uint32_t kernel_hdr_page_size()
+{
+	return page_size;
+}
+
+
 static unsigned page_mask = 0;
 static unsigned mmc_blocksize = 0;
 static unsigned mmc_blocksize_mask = 0;