drm/vc4: Fix misleading name of the continuous flag.

drm/vc4: Fix misleading name of the continuous flag.

The logic was all right in the end, the name was just backwards.

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170627195839.3338-3-eric@anholt.net
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
(cherry picked from commit ec878c0756a0c202e86256dca1de307ab1189ab8)

[inki.dae: apply from rpi3-4.9.y]
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Change-Id: I4cc6246a3b99ce4739131ccf9b9621aae61ce389