ARM: dts: socfpga: Do not include skeleton.dtsi

The skeleton.dtsi file is now deprecated as noted in commit 9c0da3cc
("ARM: dts: explicitly mark skeleton.dtsi as deprecated"). The SoCFPGA
device trees already contain the nodes that are defined in skeleton.dtsi
(#address-cells, #size-cells, chosen, aliases, memory).

Including skeleton.dtsi is useless and will produce the following
warning when compiled with W=1:

Node /memory has a reg or ranges property, but no unit name
Signed-off-by: Florian Vaussard <florian.vaussard@heig-vd.ch>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm/boot/dts/socfpga.dtsi

@@ -15,7 +15,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "skeleton.dtsi"
 #include <dt-bindings/reset/altr,rst-mgr.h>
 
 / {

arch/arm/boot/dts/socfpga_arria10.dtsi

@@ -14,7 +14,6 @@
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "skeleton.dtsi"
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/reset/altr,rst-mgr-a10.h>