dma-buf: Introduce new locking convention

All dma-bufs have dma-reservation lock that allows drivers to perform
exclusive operations over shared dma-bufs. Today's dma-buf API has
incomplete locking specification, which creates dead lock situation
for dma-buf importers and exporters that don't coordinate theirs locks.

This patch introduces new locking convention for dma-buf users. From now
on all dma-buf importers are responsible for holding dma-buf reservation
lock around operations performed over dma-bufs.

This patch implements the new dma-buf locking convention by:

  1. Making dma-buf API functions to take the reservation lock.

  2. Adding new locked variants of the dma-buf API functions for drivers
     that need to manage imported dma-bufs under the held lock.

  3. Converting all drivers to the new locking scheme.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>