[U-Boot] [PATCH v2] rockchip: arm: remove no use macro

[Philipp Tomsich]

> On 28.03.2019, at 10:36, Kever Yang <kever.yang at rock-chips.com> wrote:
> 
> TIMER7_BASE is no used by source code now, remove it.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>