global: Move remaining CONFIG_SYS_* to CFG_SYS_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS 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/bcm963138.h b/include/configs/bcm963138.h
index f1b68ba..c61acf6 100644
--- a/include/configs/bcm963138.h
+++ b/include/configs/bcm963138.h
@@ -7,6 +7,6 @@
 #define __BCM963138_H
 
 #define CFG_SYS_SDRAM_BASE		0x00000000
-#define CONFIG_SYS_HZ_CLOCK		500000000
+#define CFG_SYS_HZ_CLOCK		500000000
 
 #endif