uboot-imx

ARMv8/ls2085a: Switch to passing earlycon to kernel

Since Linux v3.16-rc1 earlyprintk has been removed for arm64.
Switch to using earlycon.

Signed-off-by: Arnab Basu <arnab.basu@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>