clk: ti: add support for basic mux clock

ti,mux-clock provides now a binding for basic mux support. This is just
using the basic clock type.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --cc Documentation/devicetree/bindings/clock/ti/mux.txt
Simple merge

diff --cc drivers/clk/ti/Makefile
Simple merge

diff --cc drivers/clk/ti/composite.c
Simple merge

diff --cc drivers/clk/ti/mux.c
Simple merge

diff --cc include/linux/clk/ti.h
Simple merge