Use imx6ul hw RNG to populate blocking random number pool at start of init

recipes-core/dbus/dbus_1.10.10.bbappend

+SUMMARY = "D-Bus message bus"
+DESCRIPTION = "run dbus init script after rng-tools and networking init"
+
+INITSCRIPT_NAME = "dbus-1"
+INITSCRIPT_PARAMS = "start 03 5 3 2 . stop 20 0 1 6 ."

recipes-core/init-ifupdown/init-ifupdown_1.0.bbappend

+SUMMARY = "Basic TCP/IP networking init scripts and configuration files"
+DESCRIPTION = "Move networking start number to 02 so it runs after rng-tools"
+
+INITSCRIPT_NAME = "networking"
+INITSCRIPT_PARAMS = "start 02 2 3 4 5 . stop 80 0 6 1 ."

recipes-support/rng-tools/rng-tools/default

+# Specify rng device
+RNG_DEVICE=/dev/hwrng
+#RNG_DEVICE=/dev/urandom

recipes-support/rng-tools/rng-tools_5.bbappend

+SUMMARY = "Random number generator daemon"
+DESCRIPTION = "replace default config file with our own, and run initscript sooner"
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/rng-tools:"
+
+#start rng-tools before networking so if wlan0 is set to auto start, boot does
+#not stall waiting for the random number pool to initialize
+
+INITSCRIPT_NAME = "rng-tools"
+INITSCRIPT_PARAMS = "start 01 2 3 4 5 . stop 99 0 6 1 ."