ARM: OMAP2+: clk: remove obsolete clksel support code

The clksel clock type is no longer used for anything, it is rather
replaced with common clock divider code. Thus, remove the dead code
from kernel.

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

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

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

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