rockchip: clk: rk3288: add clk_enable function and support USB HOST0/HSIC

rockchip: clk: rk3288: add clk_enable function and support USB HOST0/HSIC

The generic ehci-driver (ehci-generic.c) will try to enable the clocks
listed in the DTSI. If this fails (e.g. due to clk_enable not being
implemented in a driver and -ENOSYS being returned by the clk-uclass),
the driver will bail our and print an error message.

This implements a minimal clk_enable for the RK3288 and supports the
clocks mandatory for the EHCI controllers; as these are enabled by
default we simply return success.

Signed-off-by: Wadim Egorov <[email protected]>
Acked-by: Philipp Tomsich <[email protected]>
Reviewed-by: Philipp Tomsich <[email protected]>