[ARM] 4059/1: VR1000: fix LED3's platform device number

LED 3 should have been registered with the
platform deviceid of 3, instead of 1 (which
was used for LED 1).

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>