drm/bridge: ti-sn65dsi86: Fix kernel-doc typo ln_polr => ln_polrs

This fixes a kernel doc warning due to a typo:
  warning: Function parameter or member 'ln_polrs' not described in 'ti_sn_bridge'

Fixes: 5bebaead ("drm/bridge: ti-sn65dsi86: Implement lane reordering + polarity")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200612123003.v2.3.Ib616e311c48cc64b2cef11bd54d4a9cedc874bb1@changeid

drivers/gpu/drm/bridge/ti-sn65dsi86.c

@@ -122,7 +122,7 @@
  * @supplies:     Data for bulk enabling/disabling our regulators.
  * @dp_lanes:     Count of dp_lanes we're using.
  * @ln_assign:    Value to program to the LN_ASSIGN register.
- * @ln_polr:      Value for the 4-bit LN_POLRS field of SN_ENH_FRAME_REG.
+ * @ln_polrs:     Value for the 4-bit LN_POLRS field of SN_ENH_FRAME_REG.
  *
  * @gchip:        If we expose our GPIOs, this is used.
  * @gchip_output: A cache of whether we've set GPIOs to output.  This