drm/i915: fixup dma_fence_wait usage

dma_fence_wait expects a boolean for whether it should be interruptible,
not a timeout value.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211102155055.100138-1-matthew.auld@intel.com