sh: Fix build errors for generic board

This includes the following fixes:
- Define needed __init_end symbol - see initr_reloc_global_data()
- Drop SH-specific struct bd_info
- Add an empty relocate_code() function

This prevents build errors with generic board, but the code will still need
work. Perhaps this is a better alternative than deleting the code.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/sh/cpu/sh2/start.S b/arch/sh/cpu/sh2/start.S
index ebf731a..6171edc 100644
--- a/arch/sh/cpu/sh2/start.S
+++ b/arch/sh/cpu/sh2/start.S
@@ -46,8 +46,9 @@
 	mov.l	._gd_init, r13		/* global data */
 	mov.l	._stack_init, r15	/* stack */
 
-	mov.l	._sh_generic_init, r0
-	jsr	@r0
+	#TODO(sh maintainer): Fix this up to call the correct code
+	#mov.l	._sh_generic_init, r0
+	#jsr	@r0
 	nop
 
 loop:
@@ -62,4 +63,4 @@
 ._bss_end:		.long	bss_end
 ._gd_init:		.long	(_sh_start - GENERATED_GBL_DATA_SIZE)
 ._stack_init:	.long	(_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
-._sh_generic_init:	.long	sh_generic_init
+#._sh_generic_init:	.long	sh_generic_init