interfaces/{cpu,power}-control: add more accesses for commercial device tuning

[anonymouse64]

See the init_post_boot.sh[1] script for a summary of these accesses. There are
other accesses we are still evaluating where to provide them, they likely
belong in either custom-devices or in system-files for specific devices
however.

See also salesforce ticket 00320679.

[1] https://source.codeaurora.org/quic/le/snap/yaml/tree/sa8155p-gadget/postboot/init_post_boot.sh?h=UC.UM.1.0.r1-00600-sa8155.0

[codecov-commenter]

Codecov Report

Merging #11404 (45f2a0e) into master (f3f669d) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #11404   +/-   ##
=======================================
  Coverage   78.34%   78.35%           
=======================================
  Files         931      931           
  Lines      107005   107005           
=======================================
+ Hits        83838    83840    +2     
+ Misses      17951    17949    -2     
  Partials     5216     5216           

Flag	Coverage Δ
unittests	78.35% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
interfaces/builtin/cpu_control.go	100.00% <ø> (ø)
interfaces/builtin/power_control.go	100.00% <ø> (ø)
cmd/snap/cmd_debug_state.go	70.64% <0.00%> (+0.45%)	⬆️
daemon/api_connections.go	93.58% <0.00%> (+0.53%)	⬆️

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[mardy]

LGTM! That script has a few other accesses that are missing from here (polling_interval, mem_latency/*, bw_hwmon/*); I guess we don't need them then?

[anonymouse64]

LGTM! That script has a few other accesses that are missing from here (polling_interval, mem_latency/, bw_hwmon/); I guess we don't need them then?

These are being analyzed separately, I'm actually unsure if the for loop in the script with

    for device in /sys/devices/platform/soc

is supposed to actually be

    for device in /sys/devices/platform/soc/*

which will change the actual files we grant permissions for. I wanted to get these proposed while waiting for confirmation about the others

[bboozzoo]

Thanks

[alexmurray]

LGTM! Thanks.