dma-buf: use new iterator in dma_resv_wait_timeout

[ Upstream commit ada5c48b ]

This makes the function much simpler since the complex
retry logic is now handled elsewhere.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211005113742.1101-7-christian.koenig@amd.com


Stable-dep-of: 2b95a7db ("dma-buf: fix timeout handling in dma_resv_wait_timeout v2")
Signed-off-by: Sasha Levin <sashal@kernel.org>