dts: sparc: gaisler: Move SoC devicetree includes under a vendor dir

Cleans up SoC devicetree include file locations to follow the convention
of dts/<arch>/<vendor>/

Signed-off-by: Maureen Helm <[email protected]>

Author: MaureenHelm

boards/sparc/generic_leon3/generic_leon3.dts

@@ -6,7 +6,7 @@
 
 /dts-v1/;
 
-#include <leon3soc.dtsi>
+#include <gaisler/leon3soc.dtsi>
 
 / {
 	chosen {

boards/sparc/gr716a_mini/gr716a_mini.dts

@@ -6,7 +6,7 @@
 
 /dts-v1/;
 
-#include <gr716a.dtsi>
+#include <gaisler/gr716a.dtsi>
 
 / {
 	chosen {

boards/sparc/qemu_leon3/qemu_leon3.dts

@@ -6,7 +6,7 @@
 
 /dts-v1/;
 
-#include <leon3soc.dtsi>
+#include <gaisler/leon3soc.dtsi>
 
 / {
 	chosen {