[ARM] 5017/1: pxa3xx: Report unsupported wakeup sources in pxa3xx_set_wake()

pxa3xx_set_wake() silently accepts unsupported wake sources, causing
users to believe that they have succesfully configured sources that they
haven't.  Fail the operation instead.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>