arm: relocate_code() is no longer noreturn

Commit e05e5de7fae5bec79617e113916dac6631251156 made ARM's relocate_code()
return to its caller, but it did not update its declaration accordingly.

Fixing this function declaration fixes dropped C code following calls to
relocate_code().

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
diff --git a/include/common.h b/include/common.h
index d41aeb4..52df70c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -530,7 +530,11 @@
 void	dcache_enable (void);
 void	dcache_disable(void);
 void	mmu_disable(void);
-void	relocate_code (ulong, gd_t *, ulong) __attribute__ ((noreturn));
+void	relocate_code(ulong, gd_t *, ulong)
+#if !defined(CONFIG_ARM)
+__attribute__ ((noreturn))
+#endif
+;
 ulong	get_endaddr   (void);
 void	trap_init     (ulong);
 #if defined (CONFIG_4xx)	|| \