ARM: imx: pm-imx5: Fix references to imx5_cpu_suspend_info

The name of the struct, as defined in arch/arm/mach-imx/pm-imx5.c,
is imx5_cpu_suspend_info.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>