clk: rockchip: drop module parts from rk3399 and rk3568 drivers

Both of these drivers were converted to real drivers and got a tristate
build option. But them being builtin_platform_drivers, they only ever
should be build-in - as the name suggests.

So adapt the Kconfig symbol and drop the MODULE_* parts from the drivers.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20211027132616.1039814-3-heiko@sntech.de


Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>