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/ls1046a_common.h b/include/configs/ls1046a_common.h
index 40b4cb9..8a3c87c 100644
--- a/include/configs/ls1046a_common.h
+++ b/include/configs/ls1046a_common.h
@@ -40,7 +40,7 @@
 #define CPU_RELEASE_ADDR               secondary_boot_addr
 
 /* Serial Port */
-#define CONFIG_SYS_NS16550_CLK          (get_serial_clock())
+#define CFG_SYS_NS16550_CLK          (get_serial_clock())
 
 /* SD boot SPL */
 #ifdef CONFIG_SD_BOOT