ARM: dts: socfpga: memreserve first 4KB for future system use

This patch adds a /memreserve/ section to reserve the first 4K for future
use by the system. One possible use-case is trampoline code used to bring
secondary cores online.
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Pavel Machek <pavel@denx.de>
---
v3: Update commit message based on Mark Rutland's comment
v2: Add a comment in the dts files

arch/arm/boot/dts/socfpga_arria5.dtsi

@@ -15,6 +15,8 @@
  */
 
 /dts-v1/;
+/* First 4KB has trampoline code for secondary cores. */
+/memreserve/ 0x00000000 0x0001000;
 #include "socfpga.dtsi"
 
 / {

arch/arm/boot/dts/socfpga_cyclone5.dtsi

@@ -16,6 +16,8 @@
  */
 
 /dts-v1/;
+/* First 4KB has trampoline code for secondary cores. */
+/memreserve/ 0x00000000 0x0001000;
 #include "socfpga.dtsi"
 
 / {