Fix openamp, libmetal and libc linking order.

- change the component dependency chain, and make openamp depend
  on libmetal and the se-proxy target on openamp
- fix libc dependency of the components and make libmetal depend on
  stdlib::c.

Change-Id: I6bbf83244d42d5006a7d5ed1f604f51c06cc4939
Signed-off-by: Gyorgy Szing <Gyorgy.Szing@arm.com>
3 files changed