tegra_mpdecision: instead of cancel/restart just mod the workqueue

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
tegra_mpdecision: remove distinction in delays between lpcpu and normal up/down
Otherwise this would have stalled the whole workqueue for 2000ms.
Rename the remaining lpcpu updelay to fit it's new function.

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
tegra_mpdecision: fix #define spacing

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>