fix(imx8m): move caam init after serial init

CAAM provides serial output during initialization, but the serial init
occurs after CAAM. This leads to serial output produced by CAAM init
function to be omitted and not displayed.

Change the order of initialization and call CAAM init after Serial. This
has no impact as Serial does not require CAAM to be initialized upfront.

Fixes: 2502709f ("plat: imx8m: Add caam module init on imx8m")
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Cc: Jacky Bai <ping.bai@nxp.com>
Change-Id: I09c0a5474a1babfb0b53c4455891689ec08b5bdb