linux-imx

drm/etnaviv: split out iova search and MMU reaping logic

With MMUv2 the command buffers need to be mapped through the MMU.
Split out the iova search and MMU reaping logic so it can be reused
for the cmdbuf mapping, where no GEM object is involved.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>