phy: marvell: cp110: mark u-boot power-off calls

It helps ATF to determine who called power off
function (U-boot/Linux) and act accordingly

Change-Id: Icfc5cbfdba64754496812154272b28c0ff639f0f
Signed-off-by: Igal Liberman <igall@marvell.com>
Reviewed-by: Grzegorz Jaszczyk <jaz@semihalf.com>
1 file changed