85xx boards: Rename CONFIG_DDR_DLL to CONFIG_SYS_FSL_ERRATUM_DDR_MSYNC_IN

This config option is for an erratum workaround; rename it to be more
clear.  Also, drop it from config files don't need it and were
undefining it.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/include/configs/stxgp3.h b/include/configs/stxgp3.h
index c2497ad..fc3881d 100644
--- a/include/configs/stxgp3.h
+++ b/include/configs/stxgp3.h
@@ -123,7 +123,7 @@
 #undef CONFIG_FSL_DDR_INTERACTIVE
 
 #undef  CONFIG_DDR_ECC			/* only for ECC DDR module */
-#define CONFIG_DDR_DLL                  /* possible DLL fix needed */
+#define CONFIG_SYS_FSL_ERRATUM_DDR_MSYNC_IN	/* possible DLL fix needed */
 #define CONFIG_DDR_2T_TIMING		/* Sets the 2T timing bit */
 
 #define CONFIG_MEM_INIT_VALUE		0xDeadBeef