firmware: sdram: Remove disable_pvt option and always do the nopvt calibration

firmware: bootcode.bin: Set PVT explicitly with config.txt option

firmware: dtoverlay: Use fewer shell commands, tidy up

firmware: imx219_cypto: use 0 size sub-addresses and remove I2C_FLAGS_READ_REQUIRES_STOP
See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=147744

Author: popcornmix

boot/bootcode.bin

@@ -2,7 +2,7 @@
 if [ "$DISPLAY" == "" ]; then
 	export DISPLAY=":0.0"
 fi
-CMD="lxpanelctl alsastart >/dev/null"
+CMD="which lxpanelctl >/dev/null 2>&1 && lxpanelctl alsastart >/dev/null"
 if [ $EUID -eq 0 ]; then
         exec su pi -c "$CMD"
 else

boot/fixup.dat

@@ -2,7 +2,7 @@
 if [ "$DISPLAY" == "" ]; then
 	export DISPLAY=":0.0"
 fi
-CMD="lxpanelctl alsastop >/dev/null"
+CMD="which lxpanelctl >/dev/null 2>&1 && lxpanelctl alsastop >/dev/null"
 if [ $EUID -eq 0 ]; then
 	exec su pi -c "$CMD"
 else

boot/fixup_cd.dat

@@ -2,7 +2,7 @@
 if [ "$DISPLAY" == "" ]; then
 	export DISPLAY=":0.0"
 fi
-CMD="lxpanelctl alsastart >/dev/null"
+CMD="which lxpanelctl >/dev/null 2>&1 && lxpanelctl alsastart >/dev/null"
 if [ $EUID -eq 0 ]; then
         exec su pi -c "$CMD"
 else

boot/fixup_db.dat

@@ -2,7 +2,7 @@
 if [ "$DISPLAY" == "" ]; then
 	export DISPLAY=":0.0"
 fi
-CMD="lxpanelctl alsastop >/dev/null"
+CMD="which lxpanelctl >/dev/null 2>&1 && lxpanelctl alsastop >/dev/null"
 if [ $EUID -eq 0 ]; then
 	exec su pi -c "$CMD"
 else