clk: rockchip: rk3399: implement getting wdt/alive clocks

In order to correctly calculate the designware watchdog
timeouts, the watchdog clock is required. Implement required
clocks to facilitate this.

Signed-off-by: Jack Mitchell <ml@embed.me.uk>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
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