configs/qemu: use zImage for sh4/sh4eb samples

The default for ARM was changed to zImage in 5c67cb1d, however the
sh4/sh4eb sample configs were updated to switch to uImage in error,
hence end up building uImage which doesn't work with Qemu.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
[Thomas: fix commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2 files changed