arch/acpi.h: add #if guard to handle the absence of device_t type

Avoid the inclusion of a function declaration if the argument type
device_t is not defined.

This was not a problem until now because the
old declaration of device_t and the new one overlapped.

Change-Id: I05a6ef1bf65bf47f3c6933073ae2d26992348813
Signed-off-by: Antonello Dettori <dev@dettori.io>
Reviewed-on: https://review.coreboot.org/16404
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions