ARM: OMAP2+: clock: export driver API to setup/get clock features

As most of the clock driver support code is going to be moved under
drivers/clk/ti, an API for setting / getting the SoC specific clock
features is needed. This patch provides this API and changes the
existing code to use it.

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

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

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

diff --cc arch/arm/mach-omap2/clock.h
Simple merge

diff --cc arch/arm/mach-omap2/clock3xxx.c
Simple merge

diff --cc arch/arm/mach-omap2/dpll3xxx.c
Simple merge

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

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