images: rhel-ubi: fix intel-trust-authority-as feature

Unlike Trustee upstream Dockerfile, KBS_FEATURES ARG does not
get into cargo features since make is used.

Fixes 972b305 by moving KBS_FEATURES as AS_FEATURE.

Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>

Author: mythi

kbs/docker/rhel-ubi/Dockerfile

@@ -39,7 +39,7 @@ ENV OPENSSL_NO_VENDOR=1
 #  export OPENSSL_NO_VENDOR=1; \
 # fi && \
 RUN ARCH=$(uname -m) && \
-pushd kbs && make AS_FEATURE=coco-as-builtin ALIYUN=${ALIYUN} ARCH=${ARCH} && make ARCH=${ARCH} install-kbs && popd
+pushd kbs && make AS_FEATURE=${KBS_FEATURES} ALIYUN=${ALIYUN} ARCH=${ARCH} && make ARCH=${ARCH} install-kbs && popd
 
 
 # Check the sha256sum of the Intel provided RPMs on x86_64.