tc: Remove ARM_ARCH_FEATURE from TC3 build configs

These optional architectural extensions are normally enabled
by default in the compilers. The ARM_ARCH_FEATURE option is not
strictly necessary, make the build configurations clearer
by removing it.

Change-Id: Id2108653c868d6fb17cd4c464bcefdfae7de053d
Signed-off-by: David Vincze <david.vincze@arm.com>
2 files changed