post: Move CONFIG_SYS_POST to CFG_SYS_POST

Migrate the rest of the CONFIG_SYS_POST macros over to CFG_SYS_POST
namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/serial.h b/include/serial.h
index f4d7dc5..42bdf37 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -14,7 +14,7 @@
 	int	(*tstc)(void);
 	void	(*putc)(const char c);
 	void	(*puts)(const char *s);
-#if CFG_POST & CONFIG_SYS_POST_UART
+#if CFG_POST & CFG_SYS_POST_UART
 	void	(*loop)(int);
 #endif
 	struct serial_device	*next;
@@ -242,7 +242,7 @@
 	 * @return 0 if OK, -ve on error
 	 */
 	int (*clear)(struct udevice *dev);
-#if CFG_POST & CONFIG_SYS_POST_UART
+#if CFG_POST & CFG_SYS_POST_UART
 	/**
 	 * loop() - Control serial device loopback mode
 	 *