sm501: Add panel hardware cursor registers also to read function

These were forgotten when adding panel layer support in ffd39257018
"SM501 emulation for R2D-SH4".

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
[dwg: Added reference to earlier commit in message]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/display/sm501.c

@@ -956,6 +956,19 @@ static uint64_t sm501_disp_ctrl_read(void *opaque, hwaddr addr,
         ret = s->dc_panel_v_sync;
         break;
 
+    case SM501_DC_PANEL_HWC_ADDR:
+        ret = s->dc_panel_hwc_addr;
+        break;
+    case SM501_DC_PANEL_HWC_LOC:
+        ret = s->dc_panel_hwc_location;
+        break;
+    case SM501_DC_PANEL_HWC_COLOR_1_2:
+        ret = s->dc_panel_hwc_color_1_2;
+        break;
+    case SM501_DC_PANEL_HWC_COLOR_3:
+        ret = s->dc_panel_hwc_color_3;
+        break;
+
     case SM501_DC_VIDEO_CONTROL:
         ret = s->dc_video_control;
         break;