85xx/86xx: Rename ext_refrec to timing_cfg_3 to match docs

All the 85xx and 86xx UM describe the register as timing_cfg_3
not as ext_refrec.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/configs/MPC8610HPCD.h b/include/configs/MPC8610HPCD.h
index 9e70198..585411c 100644
--- a/include/configs/MPC8610HPCD.h
+++ b/include/configs/MPC8610HPCD.h
@@ -114,7 +114,7 @@
 #if 0 /* TODO */
 #define CFG_DDR_CS0_BNDS	0x0000000F
 #define CFG_DDR_CS0_CONFIG	0x80010202	/* Enable, no interleaving */
-#define CFG_DDR_EXT_REFRESH	0x00000000
+#define CFG_DDR_TIMING_3	0x00000000
 #define CFG_DDR_TIMING_0	0x00260802
 #define CFG_DDR_TIMING_1	0x3935d322
 #define CFG_DDR_TIMING_2	0x14904cc8