OMAP3: Fixed ARM aux ctrl register save/restore

Current value is stored on SDRAM and it is written back during wakeup.
Previously a static value of 0x72 was written there.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Acked-by: Thara Gopinath <thara@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>