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/spl.h b/include/spl.h
index 3eb27de..fb8c279 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -470,7 +470,7 @@
  * spl_set_header_raw_uboot() - Set up a standard SPL image structure
  *
  * This sets up the given spl_image which the standard values obtained from
- * config options: CONFIG_SYS_MONITOR_LEN, CONFIG_SYS_UBOOT_START,
+ * config options: CONFIG_SYS_MONITOR_LEN, CFG_SYS_UBOOT_START,
  * CONFIG_TEXT_BASE.
  *
  * @spl_image: Image description to set up