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>

arch/powerpc/include/asm/config.h

@@ -52,7 +52,7 @@
  * TODO: Convert this to a clock driver exists that can give us the UART
  * clock here.
  */
-#define CONFIG_SYS_NS16550_CLK		get_serial_clock()
+#define CFG_SYS_NS16550_CLK		get_serial_clock()
 #endif
 
 #endif /* _ASM_CONFIG_H_ */