Improve power management

1. Swap out power-profiles-daemon for tuned-ppd, which is a drop-in
   replacement and seems to work better.
2. Install and enable thermald, which improves power management and
   performance on Intel CPUs

Citations:
- https://fedoraproject.org/wiki/Changes/TunedAsTheDefaultPowerProfileManagementDaemon
- https://www.phoronix.com/review/intel-thermald-tgl

mkosi.conf.d/60-packages-hw-enablement.conf

@@ -8,7 +8,8 @@ Packages=dnsmasq # Needed for hotspot creation and networking in VMs
          libva # Supports hardware accelerated video
          libva-intel-driver # Supports hardware accelerated video
          libva-mesa-driver # Supports hardware accelerated video
-         power-profiles-daemon # Enables switching dedicated power profiles
+         tuned-ppd # Enables switching dedicated power profiles
+         thermald # Better thermal management and performance for Intel CPUs
          sof-firmware # Supports various audio chipsets
          splix # Supports certain Samsung printers
          tpm2-tss

mkosi.extra/usr/lib/systemd/system-preset/50-kde-linux.preset

@@ -15,7 +15,9 @@ enable systemd-zram-setup@zram0.service
 enable systemd-oomd.service
 enable bluetooth.service
 enable cups.service
-enable power-profiles-daemon.service
+enable tuned.service
+enable tuned-ppd.service
+enable thermald.service
 
 # nvidia specific services (shouldn't affect non-nvidia hardware)
 enable nvidia-suspend.service