clk: rk808: Pass the right pointer as the get_hw context

Right now we are passing a pointer to a pointer to the structure that
will be used to fetch the clk hw, which gets casted later to a pointer
to the structure, thus getting garbage in the hw structs.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Fixes: a8b6e85d ("clk: rk808: Migrate to clk_hw based OF and
registration APIs")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>