global: Migrate CONFIG_MXC_USB_FLAGS et al to CFG

Perform simple renames of:
   CONFIG_MXC_USB_FLAGS to CFG_MXC_USB_FLAGS
   CONFIG_MXC_USB_PORT to CFG_MXC_USB_PORT
   CONFIG_MXC_USB_PORTSC to CFG_MXC_USB_PORTSC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/embestmx6boards.h b/include/configs/embestmx6boards.h
index 81a92c9..31c7e10 100644
--- a/include/configs/embestmx6boards.h
+++ b/include/configs/embestmx6boards.h
@@ -18,8 +18,8 @@
 #define PHYS_SDRAM_SIZE		(1u * 1024 * 1024 * 1024)
 
 /* USB Configs */
-#define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
-#define CONFIG_MXC_USB_FLAGS	0
+#define CFG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
+#define CFG_MXC_USB_FLAGS	0
 
 /* MMC Configs */
 #define CFG_SYS_FSL_ESDHC_ADDR      0