staging: vt6656: lock changes: csMgmt_xmit.

csMgmt_xmit is nolonger atomically called but part of must be.

Reorder the function so that RFbSetPower is called first.

Add new lock spinlock for the remainder of the function.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>