setup: don't remove alsa-utils

Lots of packages appear to have grown dependencies on alsa-utils in Bookworm,
including some that TeslaUSB wants, so don't remove alsa-utils when making
root and boot read-only..
(specifically, this change was prompted by raspberrypi-sys-mods being removed
when alsa-utils is removed)

setup/pi/make-root-fs-readonly.sh

@@ -50,7 +50,7 @@ systemctl disable radxa-adbd radxa-usbnet &> /dev/null || true
 systemctl disable armbian-led-state &> /dev/null || true
 
 log_progress "Removing unwanted packages..."
-apt-get remove -y --force-yes --purge triggerhappy logrotate dphys-swapfile bluez alsa-utils
+apt-get remove -y --force-yes --purge triggerhappy logrotate dphys-swapfile bluez
 apt-get -y --force-yes autoremove --purge
 # Replace log management with busybox (use logread if needed)
 log_progress "Installing ntp and busybox-syslogd..."