Serial driver is getting clk information via DT that's why
also clk node needs to have this flag.
Different behavior was introduced by:
"dm: Use dm_scan_fdt_dev() directly where possible"
(sha1: 911954859d)
where simple-bus driver starts to call dm_scan_fdt_dev() which has
additional logic around pre_reloc_only parameter which exclude
clk nodes.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
