fix(imx8m): correct serial output for HAB JR0

Serial output is missing the EOL marker, which makes the output garbled.

Add EOL to the output, which adds a newline and makes log output
consistent.

Fixes: 77850c96 ("feat(plat/imx8m): do not release JR0 to NS if HAB is using it")
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Cc: Franck LENORMAND <franck.lenormand@nxp.com>
Cc: Jacky Bai <ping.bai@nxp.com>
Change-Id: I58b67f441016122bc9361d7224d310522917eff0