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/cpu.c b/arch/sh/cpu/sh2/cpu.c
index a2f856f..9a93cf5 100644
--- a/arch/sh/cpu/sh2/cpu.c
+++ b/arch/sh/cpu/sh2/cpu.c
@@ -83,3 +83,9 @@
 {
 	return 0;
 }
+
+void relocate_code(ulong start_addr_sp, gd_t *new_gd, ulong relocaaddr)
+{
+	/* TODO(sh maintainer): Implement this */
+	while (1);
+}