ulp: change deprecated headers to use relative includes to avoid recursivly including the same header

components/ulp/ulp_riscv/include/esp32s2/ulp_riscv.h

@@ -3,6 +3,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#pragma once
 
 #warning Contents of esp32s2/ulp_riscv.h have been merged with ulp_riscv.h. Please include the later to avoid the warning.
-#include "ulp_riscv.h"
+#include "../ulp_riscv.h"

components/ulp/ulp_riscv/include/ulp_riscv/ulp_riscv.h

@@ -3,6 +3,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#pragma once
 
-#warning Contents of ulp_riscv/ulp_riscv.h have been merged with ulp_riscv_utils.Please include the later to avoid the warning.
-#include "ulp_riscv_utils.h"
+#warning Contents of ulp_riscv/ulp_riscv.h have been deprecated. Please include the header which contains the actual definitions you are trying to use, e.g. "ulp_riscv_register_ops.h".
+#include "../ulp_riscv_register_ops.h"

components/ulp/ulp_riscv/include/ulp_riscv/ulp_riscv_gpio.h

@@ -4,5 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#warning ulp_riscv_gpio.h has been moved one level up. Please include the file without the ulp_riscv prefix.
-#include "ulp_riscv_gpio.h"
+#pragma once
+
+#warning "ulp_riscv_gpio.h has been moved one level up. Please include the file without the ulp_riscv prefix."
+#include "../ulp_riscv_gpio.h"

components/ulp/ulp_riscv/include/ulp_riscv/ulp_riscv_register_ops.h

@@ -3,6 +3,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#pragma once
 
 #warning ulp_riscv_register_ops.h has been moved one level up. Please include the file without the ulp_riscv prefix.
-#include "ulp_riscv_register_ops.h"
+#include "../ulp_riscv_register_ops.h"

components/ulp/ulp_riscv/include/ulp_riscv/ulp_riscv_utils.h

@@ -3,6 +3,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+#pragma once
 
 #warning ulp_riscv_utils.h has been moved one level up. Please include the file without the ulp_riscv prefix.
-#include "ulp_riscv_utils.h"
+#include "../ulp_riscv_utils.h"