clk: mediatek: Refactor pllfh registration to pass device

clk: mediatek: Refactor pllfh registration to pass device

After refactoring all of PLL to pass the device, it's now fairly easy to
refactor pllfh and its users, as pllfh registration wraps PLL
registration.

Do this refactor and move all of the pllfh users to pass the device as
well.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>