global: Move remaining CONFIG_SYS_NS16550_* to CFG_SYS_NS16550_*

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS_NS16550
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/tb100.h b/include/configs/tb100.h
index 38a43b7..92ee920 100644
--- a/include/configs/tb100.h
+++ b/include/configs/tb100.h
@@ -19,7 +19,7 @@
 /*
  * UART configuration
  */
-#define CONFIG_SYS_NS16550_CLK		166666666
+#define CFG_SYS_NS16550_CLK		166666666
 
 /*
  * Even though the board houses Realtek RTL8211E PHY