arm7/9: remove unused post_restore_context

Unused. If something should happen after context restore, then the
calling code can just do it afterwards.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

src/target/arm7_9_common.c

@@ -1726,9 +1726,6 @@ int arm7_9_restore_context(struct target *target)
 	arm7_9->write_pc(target, buf_get_u32(armv4_5->pc->value, 0, 32));
 	armv4_5->pc->dirty = 0;
 
-	if (arm7_9->post_restore_context)
-		arm7_9->post_restore_context(target);
-
 	return ERROR_OK;
 }