global: Move remaining CONFIG_SYS_SDRAM_* to CFG_SYS_SDRAM_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_SDRAM
namespace do not easily transition to Kconfig. In many cases they likely
should come from the device tree instead. Move these out of CONFIG
namespace and in to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/mt7621.h b/include/configs/mt7621.h
index e09e9c8..1211bb4 100644
--- a/include/configs/mt7621.h
+++ b/include/configs/mt7621.h
@@ -8,7 +8,7 @@
 #ifndef __CONFIG_MT7621_H
 #define __CONFIG_MT7621_H
 
-#define CONFIG_SYS_SDRAM_BASE		0x80000000
+#define CFG_SYS_SDRAM_BASE		0x80000000
 
 #define CONFIG_VERY_BIG_RAM
 #define CONFIG_MAX_MEM_MAPPED		0x1c000000