uboot-imx

MLK-21828-2 common: board_f: Use cpu_get_current_dev in print_cpuinfo

Current print_cpuinfo gets the first udevice in CPU class to return
the cpu info. This has problem if the boot CPU is not fixed.

Change to use new API cpu_get_current_dev to resolve the issue.

Signed-off-by: Ye Li <ye.li@nxp.com>