fsl: refactor MPC8610 and MPC5121 DIU code to use existing bitmap and logo features

The Freescale MPC8610 and MPC5121 DIU code had re-implement two features that already
existed in U-Boot: bitmap drawing and top-of-screen logo (CONFIG_VIDEO_LOGO).
So delete the 8610-specific code and use the built-in features instead.

Signed-off-by: Timur Tabi <timur@freescale.com>
diff --git a/board/freescale/mpc8610hpcd/mpc8610hpcd.c b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
index 6578f58..f67f3e3 100644
--- a/board/freescale/mpc8610hpcd/mpc8610hpcd.c
+++ b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
@@ -36,7 +36,7 @@
 
 void sdram_init(void);
 phys_size_t fixed_sdram(void);
-void mpc8610hpcd_diu_init(void);
+int mpc8610hpcd_diu_init(void);
 
 
 /* called before any console output */
@@ -84,10 +84,6 @@
 	i2c_read(0x38, 0x0A, 1, &tmp_val, sizeof(tmp_val));
 	debug("DVI Encoder Read: 0x%02lx\n",tmp_val);
 
-#ifdef CONFIG_FSL_DIU_FB
-	mpc8610hpcd_diu_init();
-#endif
-
 	return 0;
 }