profiles: Enable TPM2 support in systemd

We could use systemd-cryptenroll and cryptsetup with a TPM device but
so far the support was not compiled in.
Enable the use flags for TPM2 support in systemd.

build_packages

@@ -272,7 +272,7 @@ if [[ "${FLAGS_usepkgonly}" -eq "${FLAGS_FALSE}" ]]; then
   break_dep_loop sys-apps/util-linux udev,systemd,cryptsetup \
                  sys-fs/cryptsetup udev \
                  sys-fs/lvm2 udev,systemd \
-                 sys-apps/systemd cryptsetup \
+                 sys-apps/systemd cryptsetup,tpm \
                  net-misc/curl http2 \
                  net-libs/nghttp2 systemd
 fi

sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/package.use

@@ -29,7 +29,7 @@ app-admin/sudo -sendmail
 
 # disable hybrid cgroup as we use the unified mode now
 # use lzma which is the default on non-gentoo systems, enable selinux,
-sys-apps/systemd -cgroup-hybrid curl idn lzma selinux
+sys-apps/systemd -cgroup-hybrid curl idn lzma selinux tpm
 net-libs/libmicrohttpd -ssl
 
 # disable kernel config detection and module building