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/board/freescale/m5373evb/README b/board/freescale/m5373evb/README
index bba5420..bfbcd5d 100644
--- a/board/freescale/m5373evb/README
+++ b/board/freescale/m5373evb/README
@@ -105,7 +105,7 @@
 CONFIG_SYS_CSn_MASK	-- defines the Chip Select Mask register
 CONFIG_SYS_CSn_CTRL	-- defines the Chip Select Control register
 
-CONFIG_SYS_SDRAM_BASE	-- defines the DRAM Base
+CFG_SYS_SDRAM_BASE	-- defines the DRAM Base
 
 2. MEMORY MAP UNDER U-BOOT AND LINUX KERNEL
 ===========================================