usb: musb-new: CONFIG_MUSB prefix replacement with CONFIG_USB_MUSB

USB-related options are usually prefixed with CONFIG_USB and platform-specific
adaptation for the MUSB controller already have a CONFIG_USB_MUSB prefix, so
this switches all MUSB-related options to a CONFIG_USB_MUSB prefix, for
consistency.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/board/phytec/pcm051/board.c b/board/phytec/pcm051/board.c
index 1bf9d73..4f3853a 100644
--- a/board/phytec/pcm051/board.c
+++ b/board/phytec/pcm051/board.c
@@ -208,7 +208,7 @@
 #endif
 
 #if defined(CONFIG_DRIVER_TI_CPSW) || \
-	(defined(CONFIG_USB_ETHER) && defined(CONFIG_MUSB_GADGET))
+	(defined(CONFIG_USB_ETHER) && defined(CONFIG_USB_MUSB_GADGET))
 int board_eth_init(bd_t *bis)
 {
 	int rv, n = 0;