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/siemens-am33x-common.h b/include/configs/siemens-am33x-common.h
index 5765f2c..c9dd750 100644
--- a/include/configs/siemens-am33x-common.h
+++ b/include/configs/siemens-am33x-common.h
@@ -38,9 +38,9 @@
 #define CONFIG_SYS_TIMERBASE		0x48040000	/* Use Timer2 */
 
 /* NS16550 Configuration */
-#define CONFIG_SYS_NS16550_CLK		(48000000)
-#define CONFIG_SYS_NS16550_COM1		0x44e09000
-#define CONFIG_SYS_NS16550_COM4		0x481a6000
+#define CFG_SYS_NS16550_CLK		(48000000)
+#define CFG_SYS_NS16550_COM1		0x44e09000
+#define CFG_SYS_NS16550_COM4		0x481a6000
 
 
 /* I2C Configuration */