drm/gma500: Add generic code for clock calculation

This patch aims to unify the bits and pieces that are common (or similar
enough) for pll clock calculations. Nothing makes use of this code yet
That will come in later patches.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>

diff --cc drivers/gpu/drm/gma500/Makefile
Simple merge

diff --cc drivers/gpu/drm/gma500/gma_display.c
Simple merge

diff --cc drivers/gpu/drm/gma500/gma_display.h
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_drv.h
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_intel_display.c
Simple merge

diff --cc drivers/gpu/drm/gma500/psb_intel_drv.h
Simple merge