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>
diff --git a/src/include/acpi/acpigen_ps2_keybd.h b/src/include/acpi/acpigen_ps2_keybd.h
index c0228bc..aeeacae 100644
--- a/src/include/acpi/acpigen_ps2_keybd.h
+++ b/src/include/acpi/acpigen_ps2_keybd.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
-#ifndef __ACPIGEN_PS2_KEYBD_H__
-#define __ACPIGEN_PS2_KEYBD_H__
+#ifndef __ACPI_ACPIGEN_PS2_KEYBD_H__
+#define __ACPI_ACPIGEN_PS2_KEYBD_H__
 
 #include <types.h>
 
@@ -38,4 +38,4 @@
 			      bool can_send_function_keys,
 			      bool has_numeric_keypad, bool has_scrnlock_key);
 
-#endif /* __ACPIGEN_PS2_KEYBD_H__ */
+#endif /* __ACPI_ACPIGEN_PS2_KEYBD_H__ */