ARM: OMAP2420: clock: get rid of fixed-div property use

Cleans up the code a bit and is useful for clock data DT conversion.

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

diff --cc arch/arm/mach-omap2/cclock2420_data.c
Simple merge

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

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