hw/lpc: fix compilation error
hw/lpc: fix compilation error

Compilation can fail when building tests if the opal-api.h include
is not pulled in via headers. Include it directly.

Signed-off-by: Nicholas Piggin <24829078df5003d9dd1dd871ca2aeb0b1cf95ef4@gmail.com>
Signed-off-by: Cédric Le Goater <2d8cace2254d4e43578d21933db015d84bcc468a@kaod.org>

qemu/skiboot,shenki/skiboot,open-power/skiboot,open-power/skiboot,open-power/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,shenki/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,legoater/skiboot,legoater/skiboot,qemu/skiboot,open-power/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot