drm/omap: HDMI PLL: use runtime pm

To make it possible to use HDMI PLL for other video outputs than HDMI,
the HDMI PLL code needs to do runtime_get/put for the HDMI IP, so that
the IP (include the PLL) is enabled.

To do that we also need to store the HDMI pdev in the hdmi_pll_data.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi.h b/drivers/gpu/drm/omapdrm/dss/hdmi.h
index 53616b0..d8757ab 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi.h
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi.h
@@ -240,6 +240,7 @@
 
 	void __iomem *base;
 
+	struct platform_device *pdev;
 	struct hdmi_wp_data *wp;
 };