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/nokia_rx51.h b/include/configs/nokia_rx51.h
index 310bdde..2623f99 100644
--- a/include/configs/nokia_rx51.h
+++ b/include/configs/nokia_rx51.h
@@ -40,12 +40,12 @@
  */
 #define V_NS16550_CLK		48000000		/* 48MHz (APLL96/2) */
 
-#define CONFIG_SYS_NS16550_CLK		V_NS16550_CLK
+#define CFG_SYS_NS16550_CLK		V_NS16550_CLK
 
 /*
  * select serial console configuration
  */
-#define CONFIG_SYS_NS16550_COM3		OMAP34XX_UART3
+#define CFG_SYS_NS16550_COM3		OMAP34XX_UART3
 
 #define CONFIG_SYS_BAUDRATE_TABLE { 4800, 9600, 19200, 38400, 57600, 115200 }