acpi: Make header #ifdefs consistent

Now that all ACPI header files are moved to src/include/acpi, this
change updates the #ifdef to __ACPI_${FILENAME}__.

BUG=b:155428745

Change-Id: Id24ee35bac318278871a26f98be7092604de01c0
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40931
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/include/acpi/acpi_pld.h

@@ -1,8 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /* This file is part of the coreboot project. */
 
-#ifndef __ACPI_PLD_H
-#define __ACPI_PLD_H
+#ifndef __ACPI_ACPI_PLD_H__
+#define __ACPI_ACPI_PLD_H__
 
 #include <acpi/acpi.h>
 #include <stdint.h>
@@ -116,4 +116,4 @@ int acpi_pld_fill_usb(struct acpi_pld *pld, enum acpi_upc_type type,
 /* Turn PLD structure into a 20 byte ACPI buffer */
 int acpi_pld_to_buffer(const struct acpi_pld *pld, uint8_t *buf, int buf_len);
 
-#endif
+#endif /* __ACPI_ACPI_PLD_H__ */