drm/bridge: nwl-dsi: Remove a check on unchanged HS clock rate from ->mode_set()

The check on unchanged HS clock rate in ->mode_set() improves
the callback's performance a bit by early return.  However,
the up-coming patch would get MIPI DSI controller and PHY ready
in ->mode_set() after that check, thus likely skipped.
So, this patch removes that check to make sure MIPI DSI controller
and PHY will be brought up and taken down from ->mode_set() and
->atomic_disable() respectively in pairs.

Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1619170003-4817-3-git-send-email-victor.liu@nxp.com

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