clk: ti: am3517: move remaining am3517 clock support code to clock driver

With legacy clock support gone, this is no longer needed under platform,
so move it under the clock driver itself. Make some exports be driver
internal definitions at the same time.

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

diff --cc arch/arm/mach-omap2/Makefile
Simple merge

diff --cc arch/arm/mach-omap2/clock3517.c
Simple merge

diff --cc arch/arm/mach-omap2/clock3517.h
Simple merge

diff --cc drivers/clk/ti/clk-3xxx.c
Simple merge

diff --cc drivers/clk/ti/clock.h
Simple merge

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