Unsigned long should not be used as per coding guidelines

We should either change them to `unsigned int` or `unsigned long long`
when the size of the variable is the same in AArch64 and AArch32 or
to `u_register_t` if it is supposed to be 32 bit wide in AArch32
and 64 bit wide in AArch64.

Signed-off-by: Deepika Bhavnani <deepika.bhavnani@arm.com>
Change-Id: I80e2a6edb33248ee88be395829abbd4c36c89abe
diff --git a/bl1/bl1_fwu.c b/bl1/bl1_fwu.c
index d222b9c..48f08d2 100644
--- a/bl1/bl1_fwu.c
+++ b/bl1/bl1_fwu.c
@@ -483,7 +483,7 @@
 	 * Flush image_info to memory so that other
 	 * secure world images can see changes.
 	 */
-	flush_dcache_range((unsigned long)&image_desc->image_info,
+	flush_dcache_range((uintptr_t)&image_desc->image_info,
 		sizeof(image_info_t));
 
 	INFO("BL1-FWU: Authentication was successful\n");