refactor(allwinner): use fdt_node_is_enabled() in AXP driver

The Allwinner AXP driver was using a private implementation of that
function, remove that in favour of our now common implementation.

Change-Id: I7bd311d73060d4bc83f93cff6bedf6c78dddd3ca
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
1 file changed