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/imx8mp_venice.h b/include/configs/imx8mp_venice.h
index b1c213c..7d36058 100644
--- a/include/configs/imx8mp_venice.h
+++ b/include/configs/imx8mp_venice.h
@@ -26,7 +26,7 @@
 #define CONFIG_SYS_INIT_RAM_ADDR        0x40000000
 #define CONFIG_SYS_INIT_RAM_SIZE        SZ_2M
 
-#define CONFIG_SYS_SDRAM_BASE           0x40000000
+#define CFG_SYS_SDRAM_BASE           0x40000000
 
 /* SDRAM configuration */
 #define PHYS_SDRAM                      0x40000000