With this i.MX25 and i.MX31 will have closer implementations.

Moreover all i.MX31 CCM registers are now present.
Signed-off-by: NJean-Christophe Dubois <jcd@tribudubois.net>
Reviewed-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>