Revert "ARM: set GD_FLG_RELOC for boards skipping relocation to RAM"

we need this due to the arm implementation which supposed that U-Boot
is in RAM when we jump to start_armboot

This reverts commit f96b44ce.
in order to do it for all arm board

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>