clk: rockchip: add an id for rk3288 crypto clk

Add an id for crypto clk to the binding header, so that it can be called
in other part.

Signed-off-by: Zain Wang <zain.wang@rock-chips.com>
Acked-by: Michael Turquette <mturquette@baylibre.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>