ARM: OMAP2: clock: add DT boot support for cpufreq_ck

The clock and clkdev for this are added manually.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --cc arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
Simple merge

diff --cc drivers/clk/ti/clk-2xxx.c
Simple merge

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