clk: rockchip: drop MODULE_ALIAS from rk3399 clock controller

As suggested by Stephen during the rk3568 clock review, the MOUDLE_ALIAS
doesn't serve any meaningful purpose, so drop it from the rk3399 as well.

Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20210315112502.343699-2-heiko@sntech.de