drm/exynos: Add basic i.MX8MM support code

This adds basic i.MX8MM glue code for the Samsung DSIM PHY.
There are still a couple of items which need to be sorted out
in drivers/gpu/drm/bridge/samsung-dsim.c before this can even
be merged, specifically:

- The dsi->out_bridge is not populated until samsung_dsim_host_attach()
  is called, however samsung_dsim_host_attach() is not called until the
  next bridge attaches and calls mipi_dsi_attach(), and that only happens
  after the DSIM calls drm_bridge_attach() on that next bridge.

- The samsung_dsim_bridge_mode_fixup() is needed for iMX8MM LCDIF to set
  the correct sync flags. This likely needs to be done in the glue code.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michael Tretter <m.tretter@pengutronix.de>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
To: dri-devel@lists.freedesktop.org
--
NOTE: This depends on https://patchwork.kernel.org/project/dri-devel/list/?series=347439

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