feat(qemu): add dummy plat_mboot_measure_key() function

Adds a dummy implementation of the plat_mboot_measure_key() function for
QEMU platform.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Change-Id: I64c1c751348c04cd359c075fc15a0d180ff55918
1 file changed