rockchip: TPL banner should depend on CONFIG_TPL_BANNER_PRINT

The generic code in common/spl/spl.c allows TPL/SPL banners to be
silenced by unsetting CONFIG_TPL_BANNER_PRINT or CONFIG_SPL_BANNER_PRINT
respectively. However, arch/arm/mach-rockchip/tpl.c prints this banner
unconditionally.

Fix the rockchip-specific tpl.c so that the TPL banner depends on
CONFIG_TPL_BANNER_PRINT in the same way as the generic code.

Signed-off-by:  <chris@arachsys.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>