Patch from Ben Dooks

From: Guillaume Gourat <guillaume.gourat@nexvision.fr>

Add MASK definitions for DCLK0 and DCLK1
Signed-off-by: NGuillaume Gourat <guillaume.gourat@nexvision.fr>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>