linux-phytec-ti

clk: rockchip: remove mux_core_reg from rockchip_cpuclk_reg_data

mux_core_reg isn't been used anywhere, let's remove it.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>