MLK-18106: drm/imx: Fix nwl_dsi-imx bridge handling
The nwl_dsi-imx which is the platform driver for the NortWest Logic DSI
host controller found on IMX platforms handles the DSI host as a bridge.
Since the drm_bridge_attach function now supports chained bridges, there
is no need for nwl_dsi_add_bridge and nwl_dsi_del_bridge functions.
Just pass the existent bridge to drm_bridge_attach.
This fixes a bug created during kernel 4.14 rebase process.
Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
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