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/asm-ppc/immap_85xx.h b/include/asm-ppc/immap_85xx.h
index da97cd4..2d07625 100644
--- a/include/asm-ppc/immap_85xx.h
+++ b/include/asm-ppc/immap_85xx.h
@@ -92,7 +92,7 @@
 	uint	cs2_config_2;		/* 0x20c8 - DDR Chip Select Configuration 2 */
 	uint	cs3_config_2;		/* 0x20cc - DDR Chip Select Configuration 2 */
 	char	res5[48];
-	uint	ext_refrec;		/* 0x2100 - DDR SDRAM Extended Refresh Recovery */
+	uint	timing_cfg_3;		/* 0x2100 - DDR SDRAM Timing Configuration Register 3 */
 	uint	timing_cfg_0;		/* 0x2104 - DDR SDRAM Timing Configuration Register 0 */
 	uint	timing_cfg_1;		/* 0x2108 - DDR SDRAM Timing Configuration Register 1 */
 	uint	timing_cfg_2;		/* 0x210c - DDR SDRAM Timing Configuration Register 2 */