ARM: RK3188 SOC: removed div and mux devices from dtsi

Several div/mux/mul options are currently not supported as other code is
missing. So these parts are removed until complete implementation of the
needed clock and multiplexer functionalities.
clocksource: dw_apb_timer: removed debug output

removed periodic output of timers needed while decoding rockchips'
timers way of working.
ARM: RK3188 SOC: removed debug dumps

Commented out the call to dump all timers and clocks of rockchip core.
Will be needed again in next phase of clock and timer implementation.
Possibly not for upstream!