qemu: fix "make check" to use OP-TEE image v2

Commit 37ab51de ("qemu: bios load OP-TEE image v2") has updated the run
and run-only targets, but not make check. Fix this.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>