Use the new 64 bit root filesystem for the pi's

This also pulls in our RT kernel, and the script to build it.

We still need to package up and build the kernel module for the
adis16505, and enable the overlay.  Not a huge deal.

Change-Id: I1a100d8ec3ce4406af27af6b555fd08840fb71fd
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/raspi/rootfs/target_configure.sh b/frc971/raspi/rootfs/target_configure.sh
index 3fd4d40..db3fb36 100755
--- a/frc971/raspi/rootfs/target_configure.sh
+++ b/frc971/raspi/rootfs/target_configure.sh
@@ -17,7 +17,6 @@
 
 apt-get install -y vim-nox \
   git \
-  python3-pip \
   cpufrequtils \
   libopencv-calib3d4.5 \
   libopencv-contrib4.5 \
@@ -37,7 +36,6 @@
   libopencv-videoio4.5 \
   libopencv-videostab4.5 \
   libopencv-viz4.5 \
-  python3-opencv \
   libnice10 \
   pmount \
   libnice-dev \
@@ -73,6 +71,7 @@
 
 systemctl enable ssh.service
 systemctl enable frc971.service
+systemctl enable frc971chrt.service
 
 # Default us to pi-971-1
 /root/bin/change_hostname.sh pi-971-1