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/bcm96756.h b/include/configs/bcm96756.h
index c8f3267..c69d177 100644
--- a/include/configs/bcm96756.h
+++ b/include/configs/bcm96756.h
@@ -6,6 +6,6 @@
 #ifndef __BCM96756_H
 #define __BCM96756_H
 
-#define CONFIG_SYS_SDRAM_BASE		0x00000000
+#define CFG_SYS_SDRAM_BASE		0x00000000
 
 #endif