board_f: Copy GD to new GD even if relocation disabled

Even if U-Boot has relocation disabled via GD_FLG_SKIP_RELOC , the
relocated stage of U-Boot still picks GD from new_gd location. The
U-Boot itself is not relocated, but GD might be, so copy the GD to
new GD location even if relocation is disabled.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Peng Fan <peng.fan@oss.nxp.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>