build(rk3576): add build configs for rk3576

This is needed to support compiling new source file.
Also updated the default tf-a build configs for rk3576.

Signed-off-by: XiaoDong Huang <derrick.huang@rock-chips.com>
Change-Id: I863aee94d9855834285ddd1c54b2e209c42a4c86
5 files changed