refactor(rk3399): m0: Makefile: use same tools as in build_macros.mk

This should make it easier to spot mistakes or reuse rules by comparing
this Makefile with build_macros.mk.

Additionally, this allows to provide flags that aren't supported by CC
(e.g. --no-warn-rwx-segments).

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Change-Id: Iba121d53959ff4f8bd10a14280c4d93a710dc9db
1 file changed