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/aarch64/bl1_arch_setup.c b/bl1/aarch64/bl1_arch_setup.c
index 624bd80..0a1cb30 100644
--- a/bl1/aarch64/bl1_arch_setup.c
+++ b/bl1/aarch64/bl1_arch_setup.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -23,7 +23,7 @@
  ******************************************************************************/
 void bl1_arch_next_el_setup(void)
 {
-	unsigned long next_sctlr;
+	u_register_t next_sctlr;
 
 	/* Use the same endianness than the current BL */
 	next_sctlr = (read_sctlr_el3() & SCTLR_EE_BIT);