usb: new board-specific USB init interface

This commit unifies board-specific USB initialization implementations
under one symbol (usb_board_init), declaration of which is available in
usb.h.

New API allows selective initialization of USB controllers whenever needed.

Signed-off-by: Mateusz Zalega <m.zalega@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/board/icpdas/lp8x4x/lp8x4x.c b/board/icpdas/lp8x4x/lp8x4x.c
index 1b68ef3..a96bed6 100644
--- a/board/icpdas/lp8x4x/lp8x4x.c
+++ b/board/icpdas/lp8x4x/lp8x4x.c
@@ -15,6 +15,7 @@
 #include <netdev.h>
 #include <serial.h>
 #include <asm/io.h>
+#include <usb.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -58,7 +59,7 @@
 #endif
 
 #ifdef	CONFIG_CMD_USB
-int usb_board_init(void)
+int board_usb_init(int index, enum board_usb_init_type init)
 {
 	writel((UHCHR | UHCHR_PCPL | UHCHR_PSPL) &
 		~(UHCHR_SSEP0 | UHCHR_SSEP1 | UHCHR_SSEP2 | UHCHR_SSE),
@@ -89,9 +90,9 @@
 	return 0;
 }
 
-void usb_board_init_fail(void)
+int board_usb_cleanup(int index, enum board_usb_init_type init)
 {
-	return;
+	return 0;
 }
 
 void usb_board_stop(void)