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/bcm96813.h b/include/configs/bcm96813.h
index 5d9e87b..37d2d91 100644
--- a/include/configs/bcm96813.h
+++ b/include/configs/bcm96813.h
@@ -6,6 +6,6 @@
 #ifndef __BCM96813_H
 #define __BCM96813_H
 
-#define CONFIG_SYS_SDRAM_BASE		0x00000000
+#define CFG_SYS_SDRAM_BASE		0x00000000
 
 #endif