dt-bindings: clock: rk3328: sync from upstream Linux kernel

dt-bindings: clock: rk3328: sync from upstream Linux kernel

This syncs the rk3328 clock header file from Linux kernel next-20200324,
to support newer hardware blocks when syncing the device tree files.

The last non-merge commit to touch it was

    0dc14b013f79 ("clk: rockchip: add clock id for watchdog pclk on rk3328")

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Loic Devulder <ldevulder@suse.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>