rockchip: clk: rk3399: handle clk_enable requests for GMAC

rockchip: clk: rk3399: handle clk_enable requests for GMAC

Since commit ba1f96672522 ("net: designware: add clock support"), the
designware GMAC driver enables all referenced clocks. While this is a
no-op for the RK3399 during boot-up (reset behaviour has all the clock
gates open anyway), we still need to handle the clock-ids passed in
the enable op of the clock-driver and return a success.

This change extends the enable-op of the rk3399 clk driver to signal
success to the caller when the clocks for the GMAC are enabled.

References: commit ba1f96672522 ("net: designware: add clock support")
Signed-off-by: Philipp Tomsich <[email protected]>
Tested-by: Klaus Goger <[email protected]>