drm/i915/dsi: convert to struct intel_display

[ Upstream commit 7c05c58 ]

struct intel_display will replace struct drm_i915_private as the main
device pointer for display code. Switch ICL DSI code over to it.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f62a3616ef15e02cf19c5d041656fc6e09b37f6a.1730146000.git.jani.nikula@intel.com
Stable-dep-of: 879f703 ("drm/i915/dsi: Use TRANS_DDI_FUNC_CTL's own port width macro")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 0131280ddf38a1a487037737c67b67646f6c7c9b)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>

Author: jnikula