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/board/sbc8641d/sbc8641d.c b/board/sbc8641d/sbc8641d.c
index b3dd9c8..519f332 100644
--- a/board/sbc8641d/sbc8641d.c
+++ b/board/sbc8641d/sbc8641d.c
@@ -135,7 +135,7 @@
 	ddr->cs1_config = CFG_DDR_CS1_CONFIG;
 	ddr->cs2_config = CFG_DDR_CS2_CONFIG;
 	ddr->cs3_config = CFG_DDR_CS3_CONFIG;
-	ddr->ext_refrec = CFG_DDR_EXT_REFRESH;
+	ddr->timing_cfg_3 = CFG_DDR_TIMING_3;
 	ddr->timing_cfg_0 = CFG_DDR_TIMING_0;
 	ddr->timing_cfg_1 = CFG_DDR_TIMING_1;
 	ddr->timing_cfg_2 = CFG_DDR_TIMING_2;
@@ -166,7 +166,7 @@
 	ddr->cs1_config = CFG_DDR2_CS1_CONFIG;
 	ddr->cs2_config = CFG_DDR2_CS2_CONFIG;
 	ddr->cs3_config = CFG_DDR2_CS3_CONFIG;
-	ddr->ext_refrec = CFG_DDR2_EXT_REFRESH;
+	ddr->timing_cfg_3 = CFG_DDR2_EXT_REFRESH;
 	ddr->timing_cfg_0 = CFG_DDR2_TIMING_0;
 	ddr->timing_cfg_1 = CFG_DDR2_TIMING_1;
 	ddr->timing_cfg_2 = CFG_DDR2_TIMING_2;