drm/gma500: drop use of DRM_UDELAY wrapper

The DRM_UDELAY wrapper from drm_os_linux.h is used in a few places,
all other places calls udelay() with no wrapper.

There is no reason to continue to use this wrapper - so drop it
and direct call udelay().
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190519195526.3422-5-sam@ravnborg.org

drivers/gpu/drm/gma500/mdfld_device.c

@@ -344,7 +344,7 @@ static int mdfld_restore_display_registers(struct drm_device *dev, int pipenum)
 
 	if (pipenum == 1) {
 		/* restore palette (gamma) */
-		/*DRM_UDELAY(50000); */
+		/* udelay(50000); */
 		for (i = 0; i < 256; i++)
 			PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));
 
@@ -406,7 +406,7 @@ static int mdfld_restore_display_registers(struct drm_device *dev, int pipenum)
 	PSB_WVDC32(pipe->conf, map->conf);
 
 	/* restore palette (gamma) */
-	/*DRM_UDELAY(50000); */
+	/* udelay(50000); */
 	for (i = 0; i < 256; i++)
 		PSB_WVDC32(pipe->palette[i], map->palette + (i << 2));
 

drivers/gpu/drm/gma500/oaktrail_device.c

@@ -327,7 +327,7 @@ static int oaktrail_restore_display_registers(struct drm_device *dev)
 
 	/* Actually enable it */
 	PSB_WVDC32(p->dpll, MRST_DPLL_A);
-	DRM_UDELAY(150);
+	udelay(150);
 
 	/* Restore mode */
 	PSB_WVDC32(p->htotal, HTOTAL_A);

drivers/gpu/drm/gma500/oaktrail_hdmi.c

@@ -815,7 +815,7 @@ void oaktrail_hdmi_restore(struct drm_device *dev)
 	PSB_WVDC32(hdmi_dev->saveDPLL_ADJUST, DPLL_ADJUST);
 	PSB_WVDC32(hdmi_dev->saveDPLL_UPDATE, DPLL_UPDATE);
 	PSB_WVDC32(hdmi_dev->saveDPLL_CLK_ENABLE, DPLL_CLK_ENABLE);
-	DRM_UDELAY(150);
+	udelay(150);
 
 	/* pipe */
 	PSB_WVDC32(pipeb->src, PIPEBSRC);