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/esd/apc405/apc405.c b/board/esd/apc405/apc405.c
index 79341f5..5cc1d0d 100644
--- a/board/esd/apc405/apc405.c
+++ b/board/esd/apc405/apc405.c
@@ -429,7 +429,7 @@
 }
 
 #if defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_BOARD_INIT)
-int board_usb_init(int index, enum board_usb_init_type init)
+int board_usb_init(int index, enum usb_init_type init)
 {
 	return 0;
 }
@@ -454,7 +454,7 @@
 	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 usb_board_stop();
 }