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/vpac270/vpac270.c b/board/vpac270/vpac270.c
index fab4636..8d777df 100644
--- a/board/vpac270/vpac270.c
+++ b/board/vpac270/vpac270.c
@@ -67,7 +67,7 @@
 #endif
 
 #ifdef	CONFIG_CMD_USB
-int board_usb_init(int index, enum board_usb_init_type init)
+int board_usb_init(int index, enum usb_init_type init)
 {
 	writel((UHCHR | UHCHR_PCPL | UHCHR_PSPL) &
 		~(UHCHR_SSEP0 | UHCHR_SSEP1 | UHCHR_SSEP2 | UHCHR_SSE),
@@ -98,7 +98,7 @@
 	return 0;
 }
 
-int board_usb_cleanup(int index, enum board_usb_init_type init)
+int board_usb_cleanup(int index, enum usb_init_type init)
 {
 	return 0;
 }