src: Remove unused <stdbool>

Change-Id: I8567a567d979bcc0c1c710f6f231d7ecdc82b126
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61058
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/acpi/soundwire.c

@@ -5,7 +5,6 @@
 #include <acpi/acpi_soundwire.h>
 #include <commonlib/helpers.h>
 #include <device/soundwire.h>
-#include <stdbool.h>
 #include <stddef.h>
 
 /* Specification-defined prefix for SoundWire properties. */