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/nitrogen6x.h b/include/configs/nitrogen6x.h
index ec5339d..9d09811 100644
--- a/include/configs/nitrogen6x.h
+++ b/include/configs/nitrogen6x.h
@@ -90,7 +90,7 @@
 /* Physical Memory Map */
 #define PHYS_SDRAM		       MMDC0_ARB_BASE_ADDR
 
-#define CONFIG_SYS_SDRAM_BASE	       PHYS_SDRAM
+#define CFG_SYS_SDRAM_BASE	       PHYS_SDRAM
 #define CONFIG_SYS_INIT_RAM_ADDR       IRAM_BASE_ADDR
 #define CONFIG_SYS_INIT_RAM_SIZE       IRAM_SIZE