Add missing cpufrequtils file for rockpi rootfs

Change-Id: I2d1eed01950f194f36a6a9a5f7ebab2d329f1e12
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/rockpi/contents/etc/default/cpufrequtils b/frc971/rockpi/contents/etc/default/cpufrequtils
new file mode 100644
index 0000000..03070fe
--- /dev/null
+++ b/frc971/rockpi/contents/etc/default/cpufrequtils
@@ -0,0 +1 @@
+GOVERNOR="performance"