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/sama5d27_wlsom1_ek.h b/include/configs/sama5d27_wlsom1_ek.h
index f826eab..1979cb3 100644
--- a/include/configs/sama5d27_wlsom1_ek.h
+++ b/include/configs/sama5d27_wlsom1_ek.h
@@ -12,8 +12,8 @@
 
 #include "at91-sama5_common.h"
 
-#undef CONFIG_SYS_AT91_MAIN_CLOCK
-#define CONFIG_SYS_AT91_MAIN_CLOCK      24000000 /* from 24 MHz crystal */
+#undef CFG_SYS_AT91_MAIN_CLOCK
+#define CFG_SYS_AT91_MAIN_CLOCK      24000000 /* from 24 MHz crystal */
 
 /* SDRAM */
 #define CFG_SYS_SDRAM_BASE		0x20000000