common: Move trap_init() out of common.h

Move this function into the init.h header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

include/init.h

@@ -208,6 +208,8 @@ int board_early_init_r(void);
 /* TODO(sjg@chromium.org): Drop this when DM_PCI migration is completed */
 void pci_init_board(void);
 
+void trap_init(unsigned long reloc_addr);
+
 #endif	/* __ASSEMBLY__ */
 /* Put only stuff here that the assembler can digest */