drm/omap: add dmm_read() and dmm_write() wrappers
This patch adds wrapper functions for readl() and writel(), dmm_read() and dmm_write(), so that we can implement workaround for DRA7 errata i878. Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com> Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
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