drm/gma500: Unify _get_core_freq for cdv and psb

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/cdv_device.c
Simple merge

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

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

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