ARM: pxa: Fix typo in zeus.c

This patch fix a typo in struct platform_device can_regulator_device.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>