Fix dynamic boosting being incorrectly diagnosed

[PhoenixCausesOof]

Previously, auto-cpufreq would only check if the intel_pstate/hwp_dynamic_boost file existed to determine if EPP was supported. This didn't account for the fact that the file's contents could be 0, so it incorrectly assumed dynamic boosting was enabled.

[AdnanHodzic]

Looks like too much was removed in terms of energy_performance_preference. Because now when I do sudo auto-cpufreq --install I end up with following error:

sudo auto-cpufreq --install
Traceback (most recent call last):
  File "/opt/auto-cpufreq/venv/bin/auto-cpufreq", line 5, in <module>
    from auto_cpufreq.bin.auto_cpufreq import main
  File "/opt/auto-cpufreq/venv/lib/python3.11/site-packages/auto_cpufreq/bin/auto_cpufreq.py", line 14, in <module>
    from auto_cpufreq.core import *
  File "/opt/auto-cpufreq/venv/lib/python3.11/site-packages/auto_cpufreq/core.py", line 904
    if Path("/sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference").exists() is false:
IndentationError: unexpected indent

[PhoenixCausesOof]

There we go. It was my first time programming Python, ever, so forgive for that.

Anyway, tested on my machine as well (didn't know that was possible, was a GUI user) and it works now.

By the way, the two issues I faced were:

1. Boolean literals are True and False, not true and false.
2. Indentation (more specifically, BECAUSE OF A SINGLE WHITESPACE CHARACTER, my code refused to compile).

[AdnanHodzic]

LGTM! It's to good to have EPP showing up again on Intel hardware, thank you for your contribution, you will be credited for your work as part of future release.

[AdnanHodzic]

@PhoenixCausesOof are you able to see EPP on intel in --monitor related to my comment in #641