drm/msm/dsi-staging: fix invalid conversion to dsi display reference

In the current implementation when LP_RX_TIMEOUT error occures, then dsi
driver is passing wrong member name to "container_of" macro to get the
reference to dsi display structure. This is will cause "container_of" to
return invalid reference of dsi display pointer. Fix this by passing the
correct member name.

Change-Id: Iaf71eeb511e3a6d5dc612a7baacc49b480a0508d
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>