feat(FHI72): Fix lcore count on Arm targets

Meson configuration was configuring a wrong maximum number of lcores on
the Arm platforms we are using (Neoverse V2 & NVIDIA Grace) as no
configuration is provided for these platforms with DPDK 20.11.9.
This commit solves this issue by requesting meson to use a generic
config that sets a high maximum number of lcores.

docker/Dockerfile.build.fhi72.native_arm.ubuntu

@@ -49,7 +49,7 @@ COPY . .
 RUN wget http://fast.dpdk.org/rel/dpdk-20.11.9.tar.xz && \
     tar -xvf dpdk-20.11.9.tar.xz && \
     cd dpdk-stable-20.11.9 && \
-    meson build && \
+    meson setup -Dmachine=default build && \
     ninja -C build && \
     ninja install -C build