clk: meson: gxbb: remove HHI_GEN_CLK_CTNL duplicate definition

HHI_GEN_CLK_CTNL is defined twice, just remove the duplicate definition

Fixes: 738f66d3 ("clk: gxbb: add AmLogic GXBB clk controller driver")
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>