usb: rename board_usb_init_type to usb_init_type

This will be used by usb_lowlevel_init so it will
no longer be used by only board specific functions.

Move definition of enum usb_init_type higher in file
so that it will be available for usb_low_level_init.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 58d925f..d31d511 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -496,7 +496,7 @@
 	.usb_flags	= PHY0_SLEEP,
 };
 
-int board_usb_init(int index, enum board_usb_init_type init)
+int board_usb_init(int index, enum usb_init_type init)
 {
 	debug("USB_udc_probe\n");
 	return s3c_udc_probe(&s5pc210_otg_data);