Rather than storing the DPMS mode (which will always be on or off) use a
boolean to store this instead.
Tested-by: NRobin Murphy <robin.murphy@arm.com>
Tested-by: NJon Medhurst <tixy@linaro.org>
Acked-by: NJon Medhurst <tixy@linaro.org>
Tested-by: NJyri Sarha <jsarha@ti.com>
Signed-off-by: NRussell King <rmk+kernel@armlinux.org.uk>