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/work_92105.h b/include/configs/work_92105.h
index 32555c9..065006f 100644
--- a/include/configs/work_92105.h
+++ b/include/configs/work_92105.h
@@ -42,7 +42,7 @@
  */
 
 /* driver configuration */
-#define CONFIG_SYS_MAX_NAND_CHIPS 1
+#define CFG_SYS_MAX_NAND_CHIPS 1
 #define CFG_SYS_NAND_BASE MLC_NAND_BASE
 
 /*